Prospecting indigenous Bt isolates for bioinsecticidal efficiency against soil-borne white grub, Holotrichia serrata (F.) (Coleoptera: Scarabaeidae)

IF 1.1 3区 农林科学 Q3 ENTOMOLOGY
M. Manoj , K. Tamilvendan , Mohan Chavan , G. Selvakumar , K. Nagaraju , C. Manjunatha
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Abstract

White grubs (Holotrichia serrata) are among the most destructive insect pests in Indian agriculture, severely affecting a wide range of crops. Despite the availability of various insecticides, managing these pests remains challenging. This study aimed at exploring efficient local Bacillus thuringiensis (Bt) strains that exhibited insecticidal activity against white grubs. Morphological characterization revealed that isolates were rod-shaped and formed endospores. 16S rRNA-based molecular characterization confirmed that the strains shared identity with Bt. Toxicity evaluation of the Bt strains against different instars of grubs showed mortality rates ranging from 0 to 100 %. Notably, 18 out of 24 strains caused 100 % mortality in first-instar grubs within one day after treatment (DAT). Further testing of these isolates against second and third-instar grubs revealed mortality rates ranging from 0 to 66.70 % (15 DAT) and 0 to 33.3 % (30 DAT), respectively. The LC50 values of these strains ranged from 149.95 to 275.46 µg/mL for first, 161.54 to 294.24 µg/mL for second, and 254.64 to 415.60 µg/mL for third instar grubs at 120 h post-treatment. The isolate UASB Bt11 exhibited best biocontrol ability against all the stages of the grub. The results also indicated that first-instar grubs are the most susceptible to Bt, with sensitivity declining in later stages. This study demonstrates the biopesticidal potential of local Bt isolates or their crystal toxin genes against H. serrata for development of insect-resistant crops like sugarcane.

Abstract Image

土产Bt分离物对土传白蛴螬(鞘翅目:金龟甲科)生物杀虫效果的研究
白蛴螬(Holotrichia serrata)是印度农业中最具破坏性的害虫之一,严重影响多种作物。尽管有各种杀虫剂,但管理这些害虫仍然具有挑战性。本研究旨在寻找对蛴螬具有杀虫活性的苏云金芽孢杆菌(Bacillus thuringiensis, Bt)菌株。形态鉴定显示分离株为杆状,形成内生孢子。基于16S rrna的分子鉴定证实菌株与Bt具有同源性,对不同龄期蛴螬的毒性评价显示,菌株的死亡率在0 ~ 100%之间。值得注意的是,24株菌株中有18株在治疗后一天内(DAT)导致一龄蛴螬100%死亡率。对这些分离物对二龄和三龄蛴螬的进一步检测显示,死亡率分别为0 - 66.70% (15 DAT)和0 - 33.3% (30 DAT)。处理120 h后,菌株1的LC50值为149.95 ~ 275.46µg/mL, 2的LC50值为161.54 ~ 294.24µg/mL, 3龄幼虫LC50值为254.64 ~ 415.60µg/mL。分离物UASB Bt11对蛴螬各阶段均表现出最好的生物防治能力。结果还表明,一龄幼虫对Bt最敏感,在后期敏感性下降。本研究证明了本地Bt分离株或其结晶毒素基因对锯齿螺旋螟的生物杀虫潜力,可用于甘蔗等抗虫作物的开发。
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来源期刊
Journal of Asia-pacific Entomology
Journal of Asia-pacific Entomology Agricultural and Biological Sciences-Insect Science
CiteScore
2.70
自引率
6.70%
发文量
152
审稿时长
69 days
期刊介绍: The journal publishes original research papers, review articles and short communications in the basic and applied area concerning insects, mites or other arthropods and nematodes of economic importance in agriculture, forestry, industry, human and animal health, and natural resource and environment management, and is the official journal of the Korean Society of Applied Entomology and the Taiwan Entomological Society.
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