Toxicity Of 4 Kinds Of Pyrrole Insecticides On Solenopsis Invicta Buren

The red imported fire ant(Solenopsis invicta Buren)is an alien invasive and extremely harmful pest in the world.Since the invasion of China in 2004,it has caused serious damage to Chinese agricultural and forestry crop production,human health,public facility security,and ecological and environmental safety.Chemical control was widely used for its rapid and effective advantages.It is currently become the most studied and most widely used control method.In this study,the micro-drip method was used to determine the contact toxicity of 4 pyrrole insecticides against red fire ant under environmental conditions.The stomach toxicity of 4 pyrrole insecticides against S.invicta was evaluated by liquid feeding method.And various grades of S.invicta larvae deliver poisonous activity.The results were as follows.1.Toxicity of 4 pyrrole agents against S.invicta workersThrough laboratory efficacy tests,the cumulative corrected mortality rate for large termites of S.invicta was 90% or more after treatment with 24 μg/mL chlorfenapyr and 90 μg/mL pyraclofenac at 24 h after treatment with 4 agents;After 48 h of treatment,24 μg/mL bromonitrile,4 μg/mL acetonitrile,40 μg /mL chlorobromonitrile,70 μg /mL azolamide,which the cumulative correction mortality rate of the large S.invicta was over 90%;After 72 h of treatment,24 μg/mL bromine,4 μg/mL of ethiprole,40 μg/mL of chloprofen,and 80 μg/mL of tolprozol,which the cumulative corrected mortality rate of the large S.invicta reached over 90%.Through the screening of the four chemical agents,the ethiprole showed a low toxicity and highly effective contact effect,followed by the contact toxicity of chlorfenapyr and chlorpronil,and the effect of zopyranil was not stable because it has the fast knockout effect for S.invicta.2.The Poisoning Activity of 4 Kinds of Pyrrole Agents S.invicta workersThe results showed that chlorfenapyr,ethiaclopramide,and chloramfenac had significant contact toxicity to the drug-feeding ants.Among them,chlorfenapyr and clenbuteril were more effective for the drug-borne ants,and the ethiacloprid was used to treat S.invicta.The drug ant poisoning effect was poor,and the cumulative mortality of the three drug treatment groups was positively correlated with the treatment time.As the mortality rate of the treated ant was increased,the mortality of the drug ant also increased.On the 5th day,the drug ant of 25.321 μg/mL chlorfenapyr and 39.976 μg/mL clopifenazole treatment group The cumulative mortality rate reached more than 90%,and it has a good effect of transmitting virus.Ephedranitrile is less effective for transmitting S.invicta,which may be due to the endo-osmosis effect of E-acetonitrile agent on S.invicta,and the anterior dorsum of S.invicta.The amount of drug left behind by the plate is reduced accordingly,resulting in the drug ant being unable to contact the drug,thus failing to reach the effect of drug transmission.3.Determination of Gastric Toxicity of 4 Pyrrole Agents S.invicta workersThe results showed that the toxicity of chlorfenapyr,ethiprole,and clopylocennocarboside on S.invicta was basically the same.The cumulative mortality of workers of the same species with different concentration gradients had significant changes.The higher the concentration of the agent,the greater the mortality rate.Among them,low concentrations of ethiacloprid and clopifencarboxil had the best stomach poisoning effect on S.invicta.At 72 h after treatment with 2 μg/mL of chlorfenapyr,the cumulative corrected mortality rate of worker ants was 98.15%.After 72 h of treatment with 2 μg/mL clochlor and chlorpromazine,the cumulative corrected mortality rate of S.invicta was 94.44%.After treatment with 128 μg/mL chlorfenapyr for 72 h,the cumulative corrected mortality rate of S.invicta was 95.59%.200 μg/mL of azole insects At 72 h after amide treatment,the cumulative corrected mortality rate of S.invicta was only 27.04%,and tolpronamide exhibited poor stomach toxicity to S.invicta.4.Activity of four pyrrole insecticides on veterinary transfer of against S.invictaOn the 10 th day of treatment,the cumulative mortality rate of female reproductive ants of E.eleganil and chlorfenapyr treatment group has reached 100%,and the cumulative mortality rate of reproductive ants of the chlorpronil treatment group reached 100% on the 12 th day;On the 6th day,the cumulative mortality rate of male reproductive ants in Ethephon treated group reached 100%.On the 7th day,the cumulative mortality rate of reproductive ants in the treatment group of chlorfenapyr and clonochlor was 100%;The cumulative mortality rate of the larval worms treated with the fenpronitrile group reached 100%.On the 8th day,the larval mortality of the chlorfenapide-treated group reached 100%,and on the 10 th day,the cumulative mortality of the larvae of the clobetasol group reached 100%.The low concentration of ethiacloprid had good stomach poisoning effect on each grade of red imported S.invicta.The lethal medium concentration of S.invicta in the brominated nitrile treated group could reach a mortality rate of 100% in a relatively short period of time.The stomach poison transmission effect of chlorobromonitrile on each grade of S.invicta was poor.