| Seed coating technology has a good control effect on the control of wheat aphids,and it is the research focus of new pesticides for the control of wheat aphids.At present,with the enhancement of aphid resistance to pesticides and the improvement of people’s awareness of food safety,it is particularly important to adopt the agricultural implementation technology of reducing control and low concentration and high control effect.This study clarified the effect of seed coating agent reduction seed dressing technology on the life parameters of wheat aphids,and screened out highquality seed coating agents suitable for aphid control.The effect of seed dressing on natural enemies of aphids provides technical support for the control of wheat aphids with neonicotinoid suspension seed coatings,and provides a scientific basis for the construction of a wheat green control system and comprehensive control of wheat aphids.And the main research results are as follows:1.The results of imidacloprid reduction seed dressing on wheat germination potential showed that M1:1(93.47%)was lower than M2:1(95.38%),M1:2(94.63%)and CK(96.47%).There was no significant difference in germination rate among the three groups,all of which were above 90 %.There were significant differences in aphid yield and mortality among different treatments under the same dosage,and the effects were M2:1> M1:1>M1:2.The average yield / mortality of S.avenae in M2 : 1seed coating treatment was 20d(0.31/80%),30d(0.09/94.3%)and 40d(0.01/93.04%).The average yield of R.padi at different seedling stages was20d(0/100%),30d(0.03/99.34%)and 40d(0/100%).The average aphid production was 20d(1.26/93.08%),30d(0.09/93.05%),40d(0.07/90.4%).However,the average yield of S.avenae was 20d(18.65/5.45%),30d(18.15/5.32%)and 40d(18.15/5.55 %).Imidacloprid reduction technology can effectively control the mortality and aphid production of Sitobion avenae,Rhopalosiphum padi and Aphis graminum,but it is basically ineffective for the control of Sitobion avenae without net.Therefore,it is proposed that the reduced seed dressing technology based on M2:1 can be applied to the pesticide reduction technology.2.The cage method simulated field imidacloprid reduction seed-dressing treatment on the dominant populations in the Huanghuaihai region(Aphis spp.Aphids have different degrees of control effect.In this experiment,the application rate reduction treatment was M2:1,and the effective dosage of60% imidacloprid was 3.6g/kg,which had significantly higher control effects on Aphis sativa and A.The control effects of the three groups of Aphis sativa at the seedling stage of 20 days were M1:2(65.97%),M1:1(73.30%),and M2:1(94.83%),and the control effects of the three groups of A.M1:2(48.46%),M1:1(48.24%),M2:1(74.35%),the control effects of the three groups in the experiment of M1:2(54.71%),M1:1(50.48 %),M2:1(82.65%).The control effects of the three groups of experiments on Aphid spp.at the seedling stage of 20 days were M1:2(79.62%),M1:1(91.08/%),M2:1(98.09%),and the three groups of experiments on A.The control effects were M1:2(73.88%),M1:1(88.75%),M2:1(93.55%),and the control effects of the three groups in the experiment of 40 days of seedling stage were M1:2(62.08%),M1 :1(65.65%),M2: 1(93.75%).In this study,the control effects of the two groups of aphids on imidacloprid were inconsistent,and the control effect was R.padi > S.avenae.3.The reduction treatment of imidacloprid and thiamethoxam significantly inhibited the field population structure of S.avenae and R.padi.The control effect of M2 : 1 in imidacloprid treatment group was significantly higher than that in the other two groups,and the control effect was(M2:1 91.81%)>(M1:1 85.26%)>(M1:2 82.08%).The results of thiamethoxam treatment group were M2:1(85.43 %)> M1:2(82.67 %)>M1:1(80.37 %).There were differences in the effects of seed coating agent reduction and seed dressing on the two natural enemies,and it had an inhibitory effect on the population of ladybugs.The average number of ladybugs treated with the two groups of original drugs was imidacloprid(17,13,18),thiamethoxam(16,11,12).However,there was no significant effect on the number of parasitic wasps.The average number of parasitic wasps was no significant difference between imidacloprid(165,195,140)and thiamethoxam(222,192,173)and CK group(405).4.In order to screen out the ideal seed coating agents for the comprehensive prevention and control of various wheat aphids,seven seed coating agents were selected to carry out field efficacy trials.The results showed that the control effect of seven treatments on wheat aphids was 80%,but there were significant differences between the groups.The 60% imidacloprid suspension seed coating agent,32%imidacloprid·tebuconazole suspension seed coating agent and 70%imidacloprid suspension seed coating agent had good control effects on wheat aphids,and the control effects were 93.05%,92.67%,93.02%,respectively.Followed by 30 % thiamethoxam suspension seed coating agent(92.38%),23% benzil · fludioxonil imidacloprid suspension seed coating agent(90.14%),35%phenyl ether · thiamethoxam suspension seed coating agent(87.2%),A suspension seed coating agent(Celest+insecticide)control effect was significantly lower than the above seed coating agent treatment.The effects of different wheat seed coating agents on ladybugs in the field showed that the number of ladybugs in treatment 1-7 was(8,6,4,4,17,8,18,11).There was a significant difference in the number of ladybugs between each suspension seed coating agent and CK(222). |
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