Insecticides Management Used in Soybean for the Control of Anticarsia gemmatalis (Hübner, 1818) (Lepidoptera: Eribidae)

Abstract

The soybean is the main agricultural product produced in Brazil. Among the States, Rio Grande do Sul was the third largest producer in the 2017/2018 harvest. However, insects interfere on the productivity and provide an increase in the cost of production. The velvetbean caterpillar, Anticarsia gemmatalis (Hübner, 1818) (Lepidoptera: Eribidae) is considered one of the main leaf stripper caterpillars. The occurrence can completely fade, reflected in the grain yield. The chemical method is the main control adopted, however, due to the inadequate management of the crop, failures are observed frequently on the field. In this context, the insecticide management is considered an alternative, still little adopted, due to a lack of knowledge between the movement action and the susceptibility of the insect. Therefore, the objective was to evaluate the performance of insecticides used in the soybean crop for the control of A. gemmatalis under laboratory conditions. In the residual and direct contact bioassays, eight treatments with five replicates were used in a completely randomized design, with 2nd and 5th instar caterpillars of A. gemmatalis. The results showed that by residual contact during 24 hours, all the treatments with exception of the control had effectiveness in both instar mortality. The treatments flubendiamide + zeta-cypermethrin and zeta-cypermethrin after four hours application reached 100% of effectiveness. Thus, aiming an integrated pest management program, where it advocated the association of different control tactics, the insecticide management with flubendiamide + zeta-cypermethrin were effective with 100% of control efficiency in both instars.

Insecticidal Traits of Variants in a Genotypically Diverse Natural Isolate of Anticarsia Gemmatalis Multiple Nucleopolyhedrovirus (AgMNPV)

“…It causes major economic damage to this crop across the Americas [ 1 , 2 , 3 , 4 ]. The main strategies employed to control A. gemmatalis outbreaks rely on the use of synthetic insecticides, a range of selective or biorational products and the cultivation of transgenic plants expressing Bt insecticidal proteins [ 5 , 6 , 7 , 8 ].…”

Phenotypic plasticity in adults of Anticarsia gemmatalis exposed to sub-doses of Bt-based bioinsecticide

“…Anticarsia gemmatalis Hünber, 1818 is one of the main defoliating species in the soybean crop in the American continent (Haase et al, 2015). However, as it is considered a polyphagous species, it migrates to other regions to colonize new areas with greater food availability (Ford et al, 1975;Pashley and Johnson, 1986;Fernandes et al, 2018). The permanence of the insect pest in tropical and subtropical environments is attributed to the continuous cultivation throughout the year, which provides the formation of green bridges (Oliveira et al, 2014;Fernandes et al, 2020).…”