Occurrence and control of white star beetle

Mid-to-late May In mid-to-late May, adults first appear and begin to feed on the sap of willow and elm trees, which has a great impact on the growth of young trees and newly transplanted trees. June In mid- to late-month of June, the large Asteraceae weed Feilian begins to bloom, and some white star beetles move to Feilian flower buds to suck sap. Morphological Characteristics: Adult body length is 17～24mm, width is 9～12mm, oval shape with bronze or bronze luster, and numerous irregular white velvet spots scattered on the body surface.The front edge of the lip base is upwardly curved, concave in the middle, with borders on both sides, and the outer sides are inclined downward; the antennae are dark brown; the compound eyes are prominent; the pronotum has irregular white velvet spots, and the posterior edge is concave; there is a very conspicuous triangular piece between the posterior corner of the pronotum and the front edge angle of the elytra, which is the mesothorax; the elytra are wide, nearly rectangular, with thick notches all over, and the white velvet spots are mostly transversely wavy; the rump is short and wide, with , with peak occurrence in June to July, causing greater harm. The number gradually decreases in mid-to-late September. According to the author's statistics on the forecast lights for many years, the location where a large number of white star beetles occur is only 20~30 meters away from the forecast lights, but the forecast lights have not attracted a single adult beetle. 2. Before the middle of May, turn over or apply the manure pile, pick up the larvae and pupae of the white star beetle, and spray 50% phoxim emulsifiable concentrate 1000 times or 4. During the initial emergence period of the white star beetle, hang narrow-mouth bottles on the trees around sunflowers, corns, orchards, etc. You can use wine bottles or cleaned waste pesticide bottles. The height of the bottle is 1~1.5 meters. Put a little pulp or wine vinegar in the bottle, and then put 7. When controlling white star beetles on willows and elms, phoxim EC and omethoate EC can be mixed and sprayed twice. It has contact, systemic and stomach poisoning effects, and the control effect is more obvious.