Crop Protection最新文献

{"title":"Botryosphaeria dothidea causes leaf spot disease on Rosa roxburghii in China","authors":"Qinyi Hu ,&nbsp;Taotao An ,&nbsp;Wei Jia ,&nbsp;Junxian Chen ,&nbsp;Ying Xu ,&nbsp;Zhu Li ,&nbsp;Haixia Ding","doi":"10.1016/j.cropro.2025.107312","DOIUrl":"10.1016/j.cropro.2025.107312","url":null,"abstract":"<div><div><em>Rosa roxburghii</em> is a perennial shrub belonging to <em>Rosaceae</em> family, is a resource for both medicinal and edible purposes. In July 2023, a survey was conducted in Guiding (26°459′N, 107°149′E), Guizhou, China. The incidence rate reached 25 % in the field of 100,00 m², which seriously affected the yield and nutritional value of <em>R roxburghii</em>. The main characteristic of the infected leaves is irregular black spots. <em>Botryosphaeria dothidea</em> was isolated from the symptomatic leaves of <em>R roxburghii</em>, and it was identified by morphological and phylogenetic (ITS, TEF1-α, TUB2). Inoculation with the representative isolate B-Y-1 on the leaves can induce leaf spot disease of <em>R roxburghii</em>. Finally, Koch's postulates were established by re-isolation and re-identification of <em>B. dothidea</em> isolates from the inoculated leaves. To our knowledge, this is the first report of leaf spot disease caused by <em>B. dothidea</em> on <em>R roxburghii</em> leaves. These findings will be helpful for formulating the prevention and management strategies for leaf spot disease of <em>R roxburghii</em> in Guizhou.</div></div>","PeriodicalId":10785,"journal":{"name":"Crop Protection","volume":"197 ","pages":"Article 107312"},"PeriodicalIF":2.5,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144298634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First report of anthracnose caused by Colletotrichum jiangxiense in Epimedium sagittatum (Sieb. et Zucc.) Maxim. from Guizhou Province, China","authors":"Kaiyun Jiang ,&nbsp;Yuanchang Luo ,&nbsp;Xiangsheng Chen ,&nbsp;Shuang Liang ,&nbsp;Wensong Zhang ,&nbsp;Zhong Li","doi":"10.1016/j.cropro.2025.107314","DOIUrl":"10.1016/j.cropro.2025.107314","url":null,"abstract":"<div><div><em>Epimedium sagittatum</em> (Sieb. et Zucc.) Maxim., a perennial medicinal plant belonging to the Berberidaceae family, exhibits therapeutic efficacy by regulating renal physiological functions. From May to October 2024, a severe outbreak of anthracnose was observed in an <em>E. sagittatum</em> plantation in Jianhe County, Guizhou Province, China, with an incidence rate of approximately 25–80 %, causing severe losses, and research regarding anthracnose in <em>E. sagittatum</em> is limited. In this study, we aimed to identify the causative. Integrated molecular analysis of ITS, <em>gapdh</em>, <em>act</em>, <em>tub2</em>, <em>chs-1</em>, and <em>his3</em> and morphological characterisation of conidia identified the isolated strains as <em>Colletotrichum jiangxiense</em>. Furthermore, experimental validation through pathogenicity assessments revealed that the disease symptoms were consistent with those documented under natural field conditions, confirming that <em>C. jiangxiense</em> as the causative pathogen. To our knowledge, this is the first report of <em>C. jiangxiense</em> causing anthracnose in <em>E. sagittatum</em>.</div></div>","PeriodicalId":10785,"journal":{"name":"Crop Protection","volume":"197 ","pages":"Article 107314"},"PeriodicalIF":2.5,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biological characteristics of high-searching individuals of the Heterorhabditis bacteriophora HBH hybrid strain for use in biocontrol","authors":"Alperen Kaan Bütüner,&nbsp;İsmail Alper Susurluk","doi":"10.1016/j.cropro.2025.107313","DOIUrl":"10.1016/j.cropro.2025.107313","url":null,"abstract":"<div><div>Entomopathogenic nematodes (EPNs) are widely used in biological control to manage insect pests. The present study aimed to select individuals with enhanced host-seeking abilities from the <em>Heterorhabditis bacteriophora</em> HBH hybrid strain using an apparatus and the selected individuals were then compared with the original strain in terms of infectivity, reproductive capacity, and storage survival. Initially, last-stage <em>Galleria mellonella</em> larvae were placed in a plastic cage at the bottom of the apparatus. Subsequently, 1000 infective juveniles (IJs) were transferred to the upper part of the apparatus, and kept at 25 °C. This process was repeated until the fifth generation was obtained. The fifth-generation individuals (termed HBH Plus) were then compared with those of the HBH hybrid strain. The results indicated that the highest efficacy of the selected individuals (HBH Plus) against <em>G. mellonella</em> and <em>Tenebrio molitor</em> larvae, <em>Rhizopertha dominica</em>, and <em>Oryzaephilus surinamensis</em> adults was 90, 73.33, 86.67, and 83.33 %, respectively. For the parental culture, these values were 76.67, 63.33, 73.33 and 73.33 %, respectively. When reproductive capacity was examined, HBH Plus producing an average of 125.333,33 IJs per <em>G. mellonella</em> larva, versus 108.741,67 in the parental strain per <em>G. mellonella</em> larva. An increase in mortality rates in the IJ stages was observed with the extension of the storage duration in both the HBH hybrid strain and HBH Plus individuals. HBH Plus reached a mortality rate of 20.21 % by month five. These findings suggest that selection for enhanced host-seeking behavior in EPNs can improve their biological control potential.</div></div>","PeriodicalId":10785,"journal":{"name":"Crop Protection","volume":"197 ","pages":"Article 107313"},"PeriodicalIF":2.5,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Life table parameters, consumption, and frass production of Plodia interpunctella on four major cultivars of Turkish hazelnut","authors":"Yunus Emre Altunç ,&nbsp;Hsin Chi ,&nbsp;Ali Güncan","doi":"10.1016/j.cropro.2025.107309","DOIUrl":"10.1016/j.cropro.2025.107309","url":null,"abstract":"<div><div>The Indian meal moth, <em>Plodia interpunctella</em> (Hübner) (Lepidoptera: Pyralidae), is a globally significant pest of stored commodities, including hazelnuts. In this study we investigated life table parameters, consumption, and frass production of <em>P. interpunctella</em> on four major Turkish hazelnut cultivars: ‘Çakıldak’, ‘Mincane’, ‘Palaz’, and ‘Tombul’. The development, fecundity, consumption, and frass production were analyzed using the age-stage, two-sex life table theory. Significant differences in developmental durations were observed among the cultivars, with insects reared on Mincane exhibiting the longest preadult development period (43.51 days). No significant differences were observed in the net reproductive rate (<em>R</em>₀), intrinsic rate of increase (<em>r</em>), and finite rate of increase (<em>λ</em>) among cultivars. The heaviest pupae were recorded on Mincane and Tombul cultivars. Consumption and frass production rates also varied among cultivars. Larvae reared on Palaz exhibited the highest net consumption rate and the lowest net frass production rate. Population projections showed the largest population size on Tombul (&gt;8.1 million individuals, including 4.6 million larvae) after 120 days, highlighting its potential risk in storage conditions. Notably, the highest larval population was on Mincane (&gt;5.6 million individuals). The projected larval population size, frass, and total consumption exhibited similar lower trends on both Çakıldak and Palaz cultivars. These results highlight the significance of hazelnut cultivar selection in the context of <em>P. interpunctella</em> management. Specifically, Çakıldak would be the most suitable choice for integrated pest management due to its lowest preadult survival rate, along with the low predicted pest population size, frass production, and total consumption.</div></div>","PeriodicalId":10785,"journal":{"name":"Crop Protection","volume":"197 ","pages":"Article 107309"},"PeriodicalIF":2.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lasiodiplodia theobromae, Pestalotiopsis clavispora and Fusarium spp. associated with pomegranate dieback and fruit rot in Tunisia","authors":"Hayfa Jabnoun-Khiareddine ,&nbsp;Rania Aydi Ben Abdallah ,&nbsp;Messaoud Mars ,&nbsp;Mejda Daami-Remadi","doi":"10.1016/j.cropro.2025.107310","DOIUrl":"10.1016/j.cropro.2025.107310","url":null,"abstract":"<div><div>Tunisia is one of the main pomegranate (<em>Punica granatum</em> L.) producing countries. Between 2018 and 2021, a 15–20 % incidence of dieback and fruit rot was observed in many pomegranate orchards along Tunisian coasts. Faced with this issue, the current study aimed to characterize the etiological agents associated with these symptoms. Morphological characterization combined with multigene-combined phylogenetic analyses revealed that five fungal species namely <em>Lasiodiplodia theobromae</em>, <em>Neopestalotiopsis clavispora</em>, <em>Fusarium equiseti</em>, <em>F. brachygibbosum</em>, and <em>F. incarnatum</em> were involved in branch dieback, while <em>L</em>. <em>theobromae</em> and <em>F. proliferatum</em> species were associated with pomegranate fruit rot symptoms. As far as our knowledge extends, this is the first report of the involvement of these fungal species in pomegranate dieback and fruit rot in Tunisia and in Africa. Pathogenicity tests carried out through inoculation of detached pomegranate cv. Gabsi shoots and fruits showed that all tested fungal species were pathogenic by inducing disease symptoms with different degrees of severity. Given the rapid and severe progress of these diseases, it is critical to implement prevention and management strategies to alleviate their incidence and reduce tree losses.</div></div>","PeriodicalId":10785,"journal":{"name":"Crop Protection","volume":"197 ","pages":"Article 107310"},"PeriodicalIF":2.5,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144254375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential of potassium silicate application on barley, Hordeum vulgare for management of corn-leaf aphid, Rhopalosiphum maidis (Fitch) L","authors":"Sunny Maanju ,&nbsp;Surender Singh Yadav ,&nbsp;Poonam Jasrotia ,&nbsp;Manoj Kumar Jat ,&nbsp;Preeti Sharma ,&nbsp;Gyanendra Singh","doi":"10.1016/j.cropro.2025.107311","DOIUrl":"10.1016/j.cropro.2025.107311","url":null,"abstract":"<div><div>Corn-leaf aphid (CLA), <em>Rhopalosiphum maidis</em> (Fitch) prefers barley (<em>Hordeum vulgare</em>) the most and suck its phloem sap. Owing to lack of resistant barley cultivars against <em>R. maidis</em>, the current study was formulated to evaluate the effect of seven silicon (Si) treatments (including control) on feeding preference of <em>R. maidis</em> on detached-barley leaf sections under free and pair choice tests in controlled conditions (20 °C; 70 ± 10 % RH) at ICAR-IIWBR (India). The treatments included different concentrations of potassium and sodium silicate as: T₁-Na₂SiO₃ 0.25 %, T₂-Na₂SiO₃ 0.5 %, T₃-Na₂SiO₃ 1 %, T₄-K₂SiO₃ 0.25 %, T₅-K₂SiO₃ 0.5 %, T₆-K₂SiO₃ 1 % and C-Control. The statistically highest Si deposition was observed in T₆-K₂SiO₃ 1 % with 0.1396 mean absorbance at 650 nm wavelength. In a similar trend, the significantly minimum number of aphids were reported on T₆-K₂SiO₃ 1 % (0.73 and 0.25) which was at-par with T₃-Na₂SiO₃ 1 % (0.88 and 0.40) under free (LSD = 0.34) and pair choice tests (LSD = 0.18), respectively. The nymph production was also significantly lowest in T₆-K₂SiO₃ 1 % with 7.04 nymphs (LSD = 2.42) and highest reduction of 82.05 % in mean number of aphids over control. Overall, potassium silicate was more effective than sodium silicate with T₆-K₂SiO₃ 1 % as the best treatment which can be utilized as an environmentally friendly approach for <em>R. maidis</em> management in barley. This study can form the basis of further investigations on prospects of silicon application for managing CLA under field conditions.</div></div>","PeriodicalId":10785,"journal":{"name":"Crop Protection","volume":"197 ","pages":"Article 107311"},"PeriodicalIF":2.5,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144271887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Farmer knowledge of cassava brown streak and cassava mosaic diseases in Tanzania","authors":"Juma W. Yabeja ,&nbsp;Mkabwa L.K. Manoko ,&nbsp;Rudolph R. Shirima ,&nbsp;James P. Legg","doi":"10.1016/j.cropro.2025.107308","DOIUrl":"10.1016/j.cropro.2025.107308","url":null,"abstract":"<div><div>The virus diseases – cassava mosaic disease (CMD) and cassava brown streak disease (CBSD) – are the most important biotic constraints to cassava production in Tanzania. They are being addressed through the dissemination of improved cassava varieties through a formalized seed (= planting material) system. For this to succeed, however, it is essential that producers of cassava seed and roots can recognize and manage the diseases. A baseline study was therefore conducted to assess farmer knowledge of CBSD and CMD in north-western and southern Tanzania. Sixty farmers were interviewed to assess their knowledge and understanding of cassava diseases. All 60 farmers were aware of the symptoms of CBSD and CMD, although few knew their names. Most use a variety of local names for these diseases, such as cassava fever, cassava fog, or other local language names that refer to other pests and diseases. None of the farmers knew the cause of CBSD, although one farmer was aware that viruses cause CMD. Most farmers had no suggestion about how these diseases spread, although some associated spread with harvesting tools (1.7 %) or drought (3.4 %). Most farmers had not received information about CMD or CBSD from any source. Information sources that were reported were extension services and cassava seed producers. The majority (&gt;71 %) of the interviewed farmers did report selecting vigorous plants for planting material in the hope of minimizing negative impacts of diseases. When choosing varieties, farmers selection criteria, in order of importance were: high yield, sweetness, storability, disease resistance, and accessibility. More than 80 % of farmers met their seed requirements by recycling material either from their own or neighbours’ plots, while 17 % sourced improved varieties obtained from seed producers. Farmers reported recycling their saved seed for an average of 7.9 years. Of the farmers who had previously grown improved varieties, 14.3 % had returned to growing local varieties primarily due to marketing challenges, but 85.7 % continued to grow the improved material. Overall, these results highlight continued weaknesses in farmer knowledge and understanding of cassava virus diseases and their associated crop losses, as well as limited recognition of the benefits of high-quality certified planting material of improved varieties. This emphasizes the need for further farmer awareness creation through training and provision of extension advice as well as strengthened efforts by cassava breeders to develop varieties that combine virus disease resistance with the other key traits demanded by farmers.</div></div>","PeriodicalId":10785,"journal":{"name":"Crop Protection","volume":"197 ","pages":"Article 107308"},"PeriodicalIF":2.5,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative age-stage, two-sex life table analysis of native and abamectin and bifenazate-resistant populations of Amblyseius swirskii Athias-Henriot (Acari: Phytoseiidae) under laboratory conditions","authors":"Ceren Doğan ,&nbsp;Nabi Alper Kumral","doi":"10.1016/j.cropro.2025.107293","DOIUrl":"10.1016/j.cropro.2025.107293","url":null,"abstract":"<div><div><em>Amblyseius swirskii</em> Athias-Henriot (Acari: Phytoseiidae) is an effective biocontrol agent used against whiteflies, thrips, and spider mites in crops. This study assessed the effects of an acaricide of abamectin + bifenazate mixture on the life tables of native (NP) and acaricide-resistant (S6) populations of <em>A. swirskii</em> under controlled conditions in growth chambers set to 28 ± 1 °C, 80 ± 5 % relative humidity, and a 16:8 h light:dark photoperiod. The S6 population, with 25-fold resistance to abamectin+bifenazate, was developed from NP through six selections. Life history and population growth parameters were analyzed under untreated and acaricide-treated conditions at the recommended concentration. Under untreated conditions, developmental durations were similar between S6 and NP, but S6 females had longer lifespans, higher fecundity, and longer oviposition periods. The intrinsic rate of increase (<em>r</em>), net reproductive rate (<em>R</em>_<em>0</em>), and finite rate of increase (<em>λ</em>) were not significantly different between S6 and NP. Under acaricide-treated conditions, S6 females had longer lifespans and oviposition periods, with significantly higher fecundity. The reproductive parameters <em>R</em>_<em>0</em>, <em>r</em>, and <em>λ</em> were higher in S6 than NP. These results suggest that resistance to abamectin and bifenazate did not negatively impact the fitness components of <em>A. swirskii,</em> providing valuable insights for integrated pest management (IPM) programs.</div></div>","PeriodicalId":10785,"journal":{"name":"Crop Protection","volume":"197 ","pages":"Article 107293"},"PeriodicalIF":2.5,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144220929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistic interactions between entomopathogenic nematodes and thiamethoxam to manage mature larvae of Carposina sasakii (Lepidoptera: Carposinidae)","authors":"Haibin Wu ,&nbsp;Ganyu Zhang ,&nbsp;Yi Zhu ,&nbsp;Yong Zhang ,&nbsp;Tingting Liu ,&nbsp;Mian Wang ,&nbsp;Kang Qiao ,&nbsp;Lili Jiang","doi":"10.1016/j.cropro.2025.107305","DOIUrl":"10.1016/j.cropro.2025.107305","url":null,"abstract":"<div><div>The peach fruit moth, <em>Carposina sasakii</em>, is a constant threat to pome and stone fruits. In this study, seven entomopathogenic nematode species (EPNs), including <em>Heterorhabditis bacteriophora</em> H06 (H06), <em>Steinernema carpocapsae</em> All (All), <em>Steinernema feltiae</em> JY-90 (JY-90), <em>S. carpocapsae</em> NC116 (NC116), <em>Steinernema longicaudum</em> X-7 (X-7), <em>S. feltiae</em> SF-SN (Sf) and <em>Heterorhabditis indica</em> LN2 (LN2) were tested for biotoxicity against <em>C. sasakii</em> mature larvae. Then the effects of temperature and soil moisture on the mortality of <em>C. sasakii</em> mature larvae caused by the three most efficient EPNs combined with thiamethoxam were further evaluated. Moreover, H06, the most effective species, was employed to determine the synergistic effects with thiamethoxam to control <em>C. sasakii</em> under laboratory and field conditions. Results showed that H06, LN2 and X-7 caused high mortality of <em>C. sasakii</em> mature larvae, and an additive effect was found between the three EPNs at 2.0 billion infective juveniles (IJs)/ha and thiamethoxam at 1.5 kg/ha under laboratory conditions. In combination with thiamethoxam, H06 caused higher mortality than X-7 and LN2 at 20 °C and substrate moisture of 10–18 %. Synergism was observed between H06 at 1.0 and 1.5 billion IJs/ha and thiamethoxam at 0.5 and 0.75 kg/ha. In the field trials, H06 at 1.0 billion IJs/ha + thiamethoxam at 0.5 kg/ha applied twice had greater control effects than that of a single treatment with H06 at 3.0 billion IJs/ha + thiamethoxam at 1.5 kg/ha. Compared to traditional chlorantraniliprole treatment, H06 + thiamethoxam displayed the greatest control effect, which reached a minimum control efficacy of 93.08 % for up to three months. Taken together, this new type technology transformed traditional chemical control using conventional spray method against adults, eggs and newly hatched larvae into the synergistic combination of a biological agent and a chemical agent against <em>C. sasakii</em> mature larvae under the soil. The results suggested that the technique to control <em>C. sasakii</em> mature larvae in soil was a promising method to be incorporated in the integrated management programs in fruit production.</div></div>","PeriodicalId":10785,"journal":{"name":"Crop Protection","volume":"197 ","pages":"Article 107305"},"PeriodicalIF":2.5,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144213232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimating the dynamic impact behavior of spray droplets on rice foliage","authors":"Tao Xu ,&nbsp;Xue Li ,&nbsp;Daipeng Lu ,&nbsp;Yihao Liu ,&nbsp;Xibing Li ,&nbsp;Shilin Wang","doi":"10.1016/j.cropro.2025.107298","DOIUrl":"10.1016/j.cropro.2025.107298","url":null,"abstract":"<div><div>Rice, as a hydrophobic plant, exhibits minimal adhesion of pesticide droplets on its foliage, posing a significant challenge in reducing droplet runoff and minimizing pesticide usage during chemical application in paddy fields. To reveal the droplet impaction mechanism on rice foliage, a computational fluid dynamics (CFD) model of droplet behavior prediction was established via the volume of fluid (VOF) method. The predictive model numerically computed the process of a single droplet impacting the horizontal rice leaf surface, and simulated the impact behavior of gas-liquid two phases on the solid surface. By exploring the dynamic collision behavior law of droplets on the target blade, the collision outcomes (adhesion, bound and shatter) of droplets on the target leaf surfaces were predicted. Simulation results showed that the droplet size and impact velocity were the main factors affecting the impact outcomes. Additionally, smaller and lower velocity droplets are more prone to retention on the target. Droplets with diameter of 100, 200, and 300 μm adhered with the impact velocity of 1.0, 0.7, and 0.5 m/s, and bounced within the impact velocity range of 1.1–6.9, 0.7–4.5, and 0.5–3.5 m/s, respectively. The critical <span><math><mrow><msub><mi>K</mi><mrow><mi>c</mi><mi>r</mi><mi>i</mi><mi>t</mi></mrow></msub></mrow></math></span> value of droplet breaking was 42.81. Subsequently, a logistic regression model was established due to critical parameters of CFD simulations. To validate the model, high-speed photography was used to track the collision behavior of droplets on rice leaves. Droplet impact test demonstrated a good agreement between predicted simulation and experimental results, proving the authenticity of using the CFD model to simulate motion of droplets impacting on the rice foliage. This is of practical significance for guiding chemical application in paddy fields.</div></div>","PeriodicalId":10785,"journal":{"name":"Crop Protection","volume":"197 ","pages":"Article 107298"},"PeriodicalIF":2.5,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144231299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}