Broflanilide effectively controls Helicoverpa armigera and Spodoptera exigua exhibiting diverse susceptibilities to chlorantraniliprole and emamectin benzoate

Abstract

BACKGROUND The cotton bollworm, Helicoverpa armigera (Hübner), and the beet armyworm, Spodoptera exigua (Hübner), are two major polyphagous lepidopteran pests of cultivated crops. They develop various levels of resistance to many frequently applied broad‐spectrum insecticides. Here, the larval susceptibilities of a laboratory population and six field‐collected populations per pest from Hunan Province, China to three insecticides were determined using a standard leaf‐dipping method in the laboratory. Field‐plot trials were conducted to verify the control efficacies of broflanilide 100 g L−1 suspension concentrate (SC), chlorantraniliprole 5% SC and emamectin benzoate 5.7% water‐dispersible granule, against H. armigera and S. exigua larvae using foliar sprays in 2013 and 2019. RESULTS Variations among H. armigera and S. exigua field populations in their susceptibility levels to the three insecticides were observed in Linli, Yueyang and Changsha counties from 2013 to 2019. They were still high susceptibility to broflanilide only, but developed low and/or moderate levels of resistance to chlorantraniliprole and emamectin benzoate. In addition, broflanilide at 25 g ha−1 provided an excellent control efficacy of 81.92% to 96.46% against these pests during the 3–14‐days period after treatment in both years, whereas chlorantraniliprole at 50 g ha−1 and emamectin benzoate at 4.5 g ha−1 exhibited significantly decreased efficacies, which were consistent with their corresponding toxicity levels. CONCLUSIONS These results suggest that broflanilide should be an important new tool for the effective control of diamide‐ and avermectin‐resistant H. armigera and S. exigua. © 2020 Society of Chemical Industry

Novel Galactosyl Moiety-Conjugated Furylchalcones Synthesized Facilely Display Significant Regulatory Effect on Plant Growth

“…For example, spinosad is a structurally unique glycosylated macrolactone with greater than 70% bioavailability into pest insects . The glycosylated abamectin B 1 exhibits 1000 times higher insecticidal activity against Spodoptera exigua than abamectin B 1 itself. , Validamycin A as a trehalose analogue can strongly inhibit several trehalases and successfully treat various diseases caused by insects and fungi . Moreover, glycosylated dihydrochalcones such as trilobatin, phlorizin, and sieboldin were found in large amounts in Malus leaves with contrasting resistance to bacterial infection .…”

Laboratory efficacy of selected synthetic insecticides against second instar invasive fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae) larvae

“…According to a recent study, the beet armyworm, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), was highly susceptible to broflanilide. Hence, broflanilide could be an important new tool alternative to synthetic insecticides to control lepidopteran pests [ 54 ].…”

Modern groups of insecticides: diamides and meta-diamides

“…Значения ПР к хлорантранилипролу у малой совки S. exigua варьировали от 8 до 12 в 2019 г. (Tang et al, 2021), что было значительно ниже, чем 630-кратная устойчивость этого вида в США (Rabelo et al, 2020).…”

“…Резистентности насекомых к мета-диамидам (брофланилид) в полевых условиях пока не вывлено (Tang et al, 2021). Следует отметить, что при лабораторной селекции брофланилидом в течение 10 поколений у капустной моли P. xylostella реализованная наследуемость h2 составила 0.033, что свидетельствует о низком риске развития резистентности у этой расы.…”