Evaluation of bioefficacy potential of entomopathogenic fungi against the whitefly (Bemisia tabaci Genn.) on cotton under polyhouse and field conditions.

Autor: Sain SK; ICAR- Central Institute for Cotton Research, Regional Station, Sirsa, Haryana, India. Electronic address: sain.skumar@gmail.com., Monga D; ICAR- Central Institute for Cotton Research, Regional Station, Sirsa, Haryana, India., Hiremani NS; ICAR- Central Institute for Cotton Research, Nagpur, Maharashtra, India., Nagrale DT; ICAR- Central Institute for Cotton Research, Nagpur, Maharashtra, India., Kranthi S; ICAR- Central Institute for Cotton Research, Nagpur, Maharashtra, India; Technical Information Section of International Cotton Advisory Committee (ICAC), Washington D.C., USA., Kumar R; ICAR- Central Institute for Cotton Research, Regional Station, Sirsa, Haryana, India., Kranthi KR; ICAR- Central Institute for Cotton Research, Nagpur, Maharashtra, India; Technical Information Section of International Cotton Advisory Committee (ICAC), Washington D.C., USA., Tuteja OP; ICAR- Central Institute for Cotton Research, Regional Station, Sirsa, Haryana, India., Waghmare VN; ICAR- Central Institute for Cotton Research, Nagpur, Maharashtra, India.
Jazyk: angličtina
Zdroj: Journal of invertebrate pathology [J Invertebr Pathol] 2021 Jul; Vol. 183, pp. 107618. Date of Electronic Publication: 2021 May 14.
DOI: 10.1016/j.jip.2021.107618
Abstrakt: The whitefly, Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae), is becoming a serious problem on Bt cotton. It causes enormous crop loss through its direct feeding and as a vector of cotton leaf curl virus. Chemical-dependent management is harming the environment and increased insecticide resistance is often observed in the fields. Identification of most virulent strains of entomopathogenic fungi (EPF) is essential to serve as an important component of an IPM program for management of B. tabaci. Compared to B. tabaci adults, the nymphal stage is reported to be more susceptible to entomopathogens, and targeting nymphs also helps vector management. We evaluated the bioefficacy of EPF and chemical pesticides against nymphs of B. tabaci on Bt cotton under polyhouse and field conditions. The bioefficacy index (BI) was considered as a mechanism to select the most effective EPF strains for field evaluation. The highest nymphal mortality under polyhouse conditions was recorded for Metarhizium anisopliae NA-01299 (86.7%), Beauveria bassiana MT-4511 (85.1%), Cordyceps javanica IT-10498 (81.1%), IT-10499 (81%), and B. bassiana NA-0409 (78.2%) relative to other EPF strains, spiromesifen (69.6%), buprofezin (62.2%) and pyriproxyfen (52.7%) at 7-days-post-spray treatment (DAS). However, among all the EPF, the highest BI was recorded in C. javanica IT-10499 (77%), IT-10495 (75.4%), Fusarium verticillioides IT-10493 (74.6%), and B. bassiana MT-4511 (73.1%). The pooled data of two-year field trials (2017-18 & 2018-19) revealed that the highest nymphal mortality was recorded for MT-4511 (85%), IT-10499 (83.2%), and pyriproxyfen 10% EC (78.6%) at 7-DAS. The BI-based selection of EPF proved to be a useful predictor of field efficacy. A sequential spray of the selected EPF would be a vital approach for resilient and sustainable integrated management of the B. tabaci nymphal population under field conditions.
(Copyright © 2021 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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