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Chinese Agricultural Science Bulletin ›› 2024, Vol. 40 ›› Issue (8): 126-131.doi: 10.11924/j.issn.1000-6850.casb2023-0732

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The Control Effect of Two Kinds of Insecticides on Solenopsis invicta in Different Seasons in Hainan Province

HAN Dongyin1(), LI Lei1, ZHU Junhong2, FU Yueguan1,3, ZHANG Fangping1()   

  1. 1 Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences/ Key Laboratory of Integrated Pest Management on Tropical Crops, Ministry of Agriculture and Rural Affairs/Hainan Key Laboratory for Monitoring and Control of Tropical Agricultural Pests, Haikou 571101
    2 School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228
    3 Sanya Research Institute, Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan 572024
  • Received:2023-11-06 Revised:2024-01-25 Online:2024-03-15 Published:2024-03-10

Abstract:

In order to find out whether applying insecticides to control Solenopsis invicta in winter can achieve good control effect, this experiment compared the control effects of 0.6% cypermethrin powder and 0.08% indocarb baits in winter and summer. The results showed that the time after treatment, the difference of seasons and the kinds of agents had significant effects on the control effect of the nests of S. invicta. The control effect of 0.6% cypermethrin on the nests of S. invicta was significantly better than 0.08% indocarb in the range of 7-30 d after treatment in winter, and the effect of 0.08% indocarb on the nest of S. invicta was higher than 0.6% cypermethrin in the range of 15-45 d in summer. The effect of 0.08% indocarb baits on the nests of S. invicta in winter increased with the increase of time after treatment, and the highest effect (82.03%) was found at 45 d after treatment. The effect of 0.08% indocarb baits on S. invicta in summer was 92.49% at 15 d after treatment, which had no significant difference compared with 30 d and 45 d. The control effect of 0.6% cypermethrin on the nest of S. invicta decreased with the increase of time after treatment, but the decrease rate was slower in winter than in summer. The control effect of the two agents on the workers of S. invicta decreased with the increase of time after treatment. The control effect of 0.08% indocarb baits on the workers was significantly higher in winter than in summer except 7 d after treatment. The control effect of 0.6% cypermethrin powder on worker ants had no significantly difference within 7 d to 30 d. But at 45 d, it was significantly higher in winter (97.86%) than in summer (80.57%). In conclusion, when the weather in Hainan is fine in winter and the temperature is between 13-21℃, 0.08% Indocarb baits or 0.6% cypermethrin powder can be used to control S. invicta. The evaluation of the control effect is postponed to 30-45 d after treatment.

Key words: Solenopsis invicta, Hainan, different seasons, control efficiency