A variety of commonly used biological pesticides can be used to control noctuid moth in grassland
Spodoptera exigua, a major migratory pest in the world, has been harmed in central and southern China and poses a serious threat to crop production in China. At present, production mainly depends on chemical pesticides to control its population development, which is likely to lead to resistance and negative impact on agricultural ecosystem. In order to reduce the use of chemical pesticides, researchers from the Institute of Plant Protection, Chinese Academy of Agricultural Sciences and other institutions tested the control effects of 10 commonly used antibiotics, microorganisms and plant-derived biological pesticides on Spodoptera exigua in the laboratory.
The results showed that the ovicidal activity of all kinds of biological pesticides was lower than 25%, but they had different control effects on larvae. Five days after treatment, the corrected control effects of 25 g/L doxycycline ME, 10% doxycycline WG and 1.5% avermectin UL on the second instar larvae were 82.67%, 76.00% and 54.67%, respectively; the corrected mortality rates of 8 billion spores/g Beauveria bassiana OF and 8,000 IU/mu L Bacillus thuringiensis SC for the second instar larvae were 60%-71.62%; the corrected mortality rates of plant-derived biopesticides were 0.3% matrine AS, 0.3% Azadirachtin EC and 6.6%. % Rotenone ME had poor control effect on the 2nd instar larvae, and the corrected mortality rate was less than 42%.
Researchers believe that doxorubicin, avermectin, Bacillus thuringiensis and Beauveria bassiana can be used to control noctuid moth in field grassland.