Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen)最新文献_第8页

Growth and sporulation of some pathogenic fungi in the presence of grapefruit extract. 葡萄柚提取物对病原菌生长和产孢的影响。

Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen) Pub Date : 2002-01-01

Leszek B Orlikowski, Cz Skrzypczak, A Jaworska-Marosz

引用次数: 0

Ee-CBP, a hevein-type antimicrobial peptide from bark of the spindle tree (Euonymus europaeus L.). 从纺锤树(Euonymus europaeus L.)树皮中提取的一种hevein型抗菌肽Ee-CBP。

Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen) Pub Date : 2002-01-01

K P B Van den Bergh, E J M Van Damme, W J Peumans, J Coosemans

引用次数: 0

Toxicity and degradation of benefin in chicken embryos. 有益素在鸡胚中的毒性和降解。

Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen) Pub Date : 2002-01-01

L Várnagy, P Budai, E Molnár, M Susan, T Fáncsi

引用次数: 0

Selection for aluminium tolerance in embryogenic lines of Citrus sinensis L. and C. aurantium L. 柑桔和金柑胚性系铝耐受性的选择。

Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen) Pub Date : 2002-01-01

Bao Toan Nguyen, Pierre C Debergh

{"title":"Selection for aluminium tolerance in embryogenic lines of Citrus sinensis L. and C. aurantium L.","authors":"Bao Toan Nguyen, Pierre C Debergh","doi":"","DOIUrl":"","url":null,"abstract":"The Citrus cultivars 'Amargo' and 'Pineapple' produce embryogenic cultures on two types of sugars, galactose and lactose. Two percent lactose is optimal for both cultivars; embryogenic callus is produced 8-10 weeks after inoculation. Whereas 2% galactose is optimal for 'Amargo', it is 3% for 'Pineapple'. Three types of embryos are recognized: whitish, greenish and heart shaped. In 8 to 10 week old cultures we do also observe a black spotted type of embryos. A high percentage of plant conversion for both cultivars is observed on a medium containing 30 mg/l of adenine and 2 mg/l of GA3 for 'Amargo'; for 'Pineapple' it is necessary to add BA. We tested two techniques for selection of Al-tolerant lines: one on stagnant liquid medium, and another on shaken liquid medium. The second technique gives a more serious selection pressure; there are almost no surviving calli. In 'Amargo' more calli survived than in 'Pineapple'. Selected calli had to be subcultured nine times to determine their stability. Four callus types of the two cultivars grew normally on selective media containing 0, 400, 1000 or 2000 mumol of aluminium.","PeriodicalId":85134,"journal":{"name":"Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen)","volume":"67 1","pages":"1-11"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22163998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of Helicoverpa Armigera resistance to pyrethroid insecticides in northern Cameroon. 喀麦隆北部棉铃虫对拟除虫菊酯类杀虫剂的抗性评价。

Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen) Pub Date : 2002-01-01

T Brévault, P Asfom, J Beyo, S Nibouche, M Vaissayre

{"title":"Assessment of Helicoverpa Armigera resistance to pyrethroid insecticides in northern Cameroon.","authors":"T Brévault, P Asfom, J Beyo, S Nibouche, M Vaissayre","doi":"","DOIUrl":"","url":null,"abstract":"In Central Africa savannas, the noctuid Helicoverpa armigera (Hübner) is a major pest of cotton and vegetable crops (including tomato and okra) which directly affects production by attacking fruit-bearing organs. In order to prevent and anticipate problems, the national cotton company (SODECOTON), with the help of the agricultural research (IRAD-PRASAC), implemented in 1999 a monitoring network for the early detection of resistance of target insects to the main recommended insecticides. Over the last three years, from 1999 up to 2001, assessment of H. armigera susceptibility to pyrethroid insecticides was carried out through both vial tests and topical bioassays. Revealed in southern and western Africa, pyrethroid resistance now seems to affect Central Africa also. Although control failure due to resistance has not yet been reported from the field, these results indicate the presence of resistant genes within H. armigera populations in Northern Cameron. Further laboratory studies confirmed the loss of susceptibility to cypermethrin in wild populations. Priority actions to be developed must focus on the rational and concerted management of pesticide use and the implementation of a regional monitoring network for the early detection of the loss of sensibility of target insects to the main recommended insecticides. At the same time, more fundamental research should be undertaken on the epidemiological profile of resistance in order to define practical ways of reducing the selection pressure.","PeriodicalId":85134,"journal":{"name":"Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen)","volume":"67 3","pages":"641-6"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22341329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of some insecticides on acetylcholinesterase from beneficial insects: Coccinella septempunctata, Chrysoperla carnea and Forficula auricularia. 几种杀虫剂对七星瓢虫、金蝶和木耳虫乙酰胆碱酯酶的影响。

Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen) Pub Date : 2002-01-01

Andras Bozsik, Frédéric Francis, Charles Gaspar, Eric Haubruge

{"title":"Effect of some insecticides on acetylcholinesterase from beneficial insects: Coccinella septempunctata, Chrysoperla carnea and Forficula auricularia.","authors":"Andras Bozsik, Frédéric Francis, Charles Gaspar, Eric Haubruge","doi":"","DOIUrl":"","url":null,"abstract":"In vitro enzyme activity of head homogenates from adults of Coccinella septempunctata, Chrysoperla carnea and Forficula auricularia originated from different habitats in Belgium (wheat, barley, rye, set-aside fields and experimental orchard, uncultivated area) were investigated in presence of insecticide active ingredients. Using the procedure of Ellman, I50 (M) and Ki (M-1 min-1) values were established. The beneficial insects showed the least susceptibility to diazinon and the differences between their measured values were not remarkable. Paraoxon was extremely toxic to the AChE of F. auricularia but Ch. carnea and C. septempunctata were similarly more tolerant to this organophosphate. In the case of malaoxon earwig and green lacewing AChEs were much more sensitive than AChE of the ladybird beetle. Measuring the carbaryl inhibition, F. auricularia was the least tolerant. The susceptibility of ladybird AChE differed highly from that of both species. According to the measured values, the green lacewing was less tolerant than the ladybird beetle but more tolerant compared with the common earwig. Summarizing our biochemical results, the order of susceptibility of beneficial insects to insecticides investigated was the following F. auricularia > Ch. carnea > C. septempunctata.","PeriodicalId":85134,"journal":{"name":"Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen)","volume":"67 3","pages":"671-7"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22341333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The potential of pathogens as biological control of parthenium weed (Parthenium hysterophorus L.) in Ethiopia. 埃塞俄比亚parthenium hysterophorus L.病原菌生物防治的潜力。

Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen) Pub Date : 2002-01-01

T Taye, M Gossmann, G Einhorn, C Büttner, R Metz, D Abate

{"title":"The potential of pathogens as biological control of parthenium weed (Parthenium hysterophorus L.) in Ethiopia.","authors":"T Taye, M Gossmann, G Einhorn, C Büttner, R Metz, D Abate","doi":"","DOIUrl":"","url":null,"abstract":"P. hsyterophorus is an exotic invasive annual weed now causing severe infestation in Ethiopia. Studies on diagnosis, incidence and distribution of pathogens associated with parthenium weed in Ethiopia were carried out from 1998-2002. Several fungal isolates were obtained from seed and other parts of parthenium plants. Among them were putative pathogenic fungal species of the genus Helminthosporium, Phoma, Curvularia, Chaetomium, Alternaria, and Fusarium. However, pathogenecity test of the isolates obtained showed no or non-specific symptoms. It was concluded that these pathogens could be opportunistic with insignificant potential for biological control of parthenium. Two most important diseases associated with parthenium were a rust disease, caused by Puccinia abrupta var. partheniicola, and a phyllody disease, caused by a phytoplasma of fababean phyllody (PBP) phytoplasma group. The rust was commonly found in cool mid altitude (1500-2500 m) areas while phyllody was observed in low to mid altitude regions (900-2500 m) of Ethiopia, with a disease incidence up to 100% and 75%, respectively, in some locations. Study of the individual effects of the rust and phyllody diseases under field conditions showed a reduction on weed morphological parameters (plant height, leaf area, and dry matter yield). Parthenium seed production was reduced by 42% and 85% due to rust and phyllody, respectively. Phyllody and rust diseases of parthenium showed significant potential for classical biological control of parthenium after further confirmation of insect vectors that transmit phyllody and host range of phyllody disease to the related economic plants in Ethiopia.","PeriodicalId":85134,"journal":{"name":"Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen)","volume":"67 3","pages":"409-20"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22342125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Novaluron (Rimon), a novel IGR--mechanism, selectivity and importance in IPM programs. 新型IGR的机制、选择性及其在IPM中的重要性。

Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen) Pub Date : 2002-01-01

Isaac Ishaaya, A Rami Horowitz, Luc Tirry, Avner Barazani

{"title":"Novaluron (Rimon), a novel IGR--mechanism, selectivity and importance in IPM programs.","authors":"Isaac Ishaaya, A Rami Horowitz, Luc Tirry, Avner Barazani","doi":"","DOIUrl":"","url":null,"abstract":"Novaluron (Rimon), a new IGR, acts by both ingestion and contact. It is a powerful toxicant for controlling lepidopteran larvae resulting in LC-90 values of 0.42 and 0.30 mg a.i./liter for Spodoptera littoralis and S. exigua, respectively. Its residual activity under field conditions ranges between 10 and 30 days depending on environmental conditions. The compound is a powerful toxicant against developing stages of whiteflies, resulting in LC-90 values of 0.68 and 8.56 mg a.i./liter for Bemisia tabaci and Trialeurodes vaporariorum, respectively. It has translaminar activity, enabling the control of the leaf miner Liriomyza huidobrensis at concentrations ranging between 5 and 45 mg a.i./liter. Novaluron has no cross-resistance with other leading compounds for controlling whiteflies such as buprofezin and pyriproxyfen. It is a rain fast compound suitable in the tropics and in rainy seasons. It has no appreciable effect on parasitoids and phytoseiids and a mild effect on other natural enemies and may be considered a potential component in IPM programs. The compound is in the process of commercialization worldwide by Makhteshim Chemical Works for controlling agricultural pests.","PeriodicalId":85134,"journal":{"name":"Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen)","volume":"67 3","pages":"617-26"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"22342582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of static and dynamic surface tension on atomisation with agricultural nozzles. 静态和动态表面张力对农用喷嘴雾化的影响。

Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen) Pub Date : 2002-01-01

Pieter Spanoghe, Hilde Van Eeckhout, Walter Steurbaut, Paul Van der Meeren

引用次数: 0

Geographical distribution and host preference of common bunt Tilletia foetidae (Wallr.) Liro and Tilletia caries (DC) Tul. on bread wheat and durum wheat. 小叶Tilletia foetidae的地理分布及寄主偏好Liro和Tilletia龋齿(DC) Tul。面包用小麦和硬粒小麦。

Mededelingen (Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen) Pub Date : 2002-01-01

S Ismail, O F Mamluk, M F Azmeh

引用次数: 0