Toxicity determination and field control effect of different biopesticides on Trialeurodes vaporariorum in greenhouse tomato
Trialeurodes vaporariorum are one of the main pests in tomato cultivation,and controlling their occurrence is of great significance for ensuring tomato yield and quality.In order to screen suitable biopesticides for green control,the toxicity effects of four biopesticides(60 g·L-1 etridiazole suspension agent,5% emamectin benzoate suspension,5% abam-ectin emulsion,0.5% matrine water solution)on T.vaporariorum were determined,and pesticide safety evaluation and field control experiments were conducted.The indoor toxicity test results showed that among the four tested biopesticides,the suspension of emamectin benzoate had the highest toxicity to T.vaporariorum in greenhouse tomato,with an LC50 of 2.251 mg·L-1;Matrine has the lowest toxicity,with an LC50 of 17.592 mg·L-1.The safety evaluation test results showed that after 21 d of treatment,all tested tomato varieties showed no symptoms of discoloration,necrosis,delayed growth and development,wilting,deformities,or other drug damage.There was no significant effect on growth rate inhibition rate and fruit drop rate.The safety factor of 60 g·L-1 etridiazole suspension agent for Golden Tent No.10 tomato was 2.0,while the safety factors of the other three agents for tomato were all 4.0.The results of field experiments showed that the insect reduction rate of the four tested biopesticides were significantly higher than those of the water control from 1 d to 15 d after treatment.Among them,the 5% emamectin benzoate suspension had the best rapid and sustained effect on con-trolling T.vaporariorum,with insect reduction rate of 63.232% to 91.276% and control effect of 58.379% to 90.823% from 1 d to 15 d after treatment.The research results provide important support and basis for the selection of biopesticides for the safe production in greenhouse tomato.
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