Document Type : Original Article
Author
Central Agricultural Pesticides Laboratory, Agriculture Research Center, Dokki, Giza, Egypt
Abstract
Fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae), is one of the most destructive pests for many agricultural crops. Since quickly develops resistance in FAW to most classes of pesticides, more effective and safer biological ways to control the pest are needed. Laboratory studies investigated the interaction between the fungal entomopathogen Beauveria bassiana, diatomaceous earth (DE) with chlorantraniliprole or emamectin benzoate when applied to 2nd instar FAW larvae. The biological parameters of B. bassiana (germination rate and average daily mycelia growth) were not inhibited by chlorantraniliprole and DE treatments, on the contrary the effect of emamectin benzoate. Interaction of B. bassiana (1 × 108 conidia/mL), chlorantraniliprole and DE exhibited maximum larval mortality (55–100%), while B. bassiana (1 × 104 conidia/mL) alone showed minimum larval mortality (5–29%) recorded at intervals 2–10 days. The results indicated the activities of mixed function oxidase (MFO), glutathione S-transferase (GST) and total esterase (EST) in FAW larvae were significantly lower than that of the control groups at different intervals post-treatment, indicating the inhibitory effect of the all-treated applications. B. bassiana combined with chlorantraniliprole and DE had better inhibition effects than applications alone.
Graphical Abstract
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Keywords
- Beauveria bassania
- Chlorantraniliprole
- Detoxification enzymes
- Emamectin benzoate
- Fall armyworm
- Synergism
Main Subjects
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