| Focus on the occurrence dynamics of meloidae, an important pest of leguminous green manure, a trap device with combination of cantharidin and sweet and sour liquid was used to trap meloidae in nine leguminous green manures in Yan'an from May to September 2020, and the control effect of the trap device was determined. The results showed that mylabris and epicauta were the main harmful genera, and mainly did harm to Vicia villosa and Vicia sativa. The first appearance of mylabris was in the middle and late May, and the peak period was in the middle and late June. The first appearance of epicauta was in the early June, and the peak period was in the late June. Combined with sweet and sour liquid, the cantharidin had the highest trapping amount, with an average of 10.17 insects per bottle (60 m2), and the control effect on meloidae was 91.86% (Vicia villosa) and 87.37% (Vicia sagittata). The trapping device can effectively solve the problem of pesticide pollution |
