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Inhibitory effects of Serjania erecta on the development of Chrysodeixis includens
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Journal Article
Inhibitory effects of Serjania erecta on the development of Chrysodeixis includens
2022
Overview
The soybean looper,
Chrysodeixis includens
, is a primary soybean pest that reduces crop productivity. This work examined control of
C. includens
populations with methanolic extract of
Serjania erecta
, a native Cerrado plant, while minimizing risks to pollinators, natural enemies and the environment.
Serjania erecta
specimens were collected, identified, and subjected to methanol extraction. Bioassays were performed using newly hatched and second-instar caterpillars and different extract concentrations on the diet surface to obtain IC
50
values. Two replicates, containing 10 caterpillars, were established in triplicate. The IC
50
values were 4.15 and 6.24 mg of extract mL
−1
for first-instar and second-instar caterpillars, respectively. These growth inhibition results informed the extract concentrations assessed in subsequent development inhibition assays, in which the pupal weight was higher under the control than under the treatments. Extract treatments increased the duration of the larval, pupal and total development. The potential of different concentrations of
S. erecta
extract to inhibit the enzymes carboxylesterases was also evaluated. Carboxylesterases activity decreased by 41.96 and 43.43% at 7.8 and 15.6 μg mL
−1
extract, respectively. At 31.3 μg mL
−1
extract, enzymatic activity was not detected. Overall,
S. erecta
leaf methanolic extract showed inhibitory potential against carboxylesterases.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
