First, the morphological characteristics Adult body length 17 to 24 cm, width 9 to 12 mm. Oval, with bronze or bronze luster. The body surface spreads many irregular white velvet spots, and the white velvet spots are mostly wavy. Second, the hazard symptoms of white star beetle adults clustered in the corn ear, starting from the cob at the top, gradually drilled into the temporal lobe, feeding grouting grains, especially the short-leaf varieties, sweet and juicy The seeds are exposed to the outside and are more hazardous. And the white star beetle also emits white porridge-like feces, which seriously affects the quality and quality of fresh-food specialty corn. Third, the law of occurrence occurs one generation a year, adults began to appear in early May, June to July is the peak period, this time a positive corn film fresh corn picking period. In addition, the white-spotted beetle is strong and has a feign death. It has a tendency toward vinegar, clustering, and spawning in the soil. Fourth, prevention and control methods 1. Agricultural control Long-leaved and tightly packed varieties, such as Zhongwan No. 1, the No. 2 cooperation, purple citron and other varieties. 2. Artificial catch insects use plastic bags to cover the ear of the killed corn and kill it manually to eliminate the adults that are feeding on the ear. 3. Entrapment of adult worms On May 25th, the fine bottle of empty wine bottles was hung on a tree near corn and corn fields. The bottle height was 1 to 1.5 meters, and 2 to 3 white star beetles were placed in the bottle. Adults in the field can be lured into the bottle and then killed, killing 40 to 50 bottles per 667 square meters. 4. Use sweet and sour liquid to kill insects. Use white beetle chafers have the tendency of vinegar taste, prepare sweet and sour liquid to kill. With sugar, vinegar, wine, water and 90% trichlorfon crystals in the ratio of 3:3:1:10:0.1 in the pot and mix well, placed on the corn field, set up the same height as the position of the ear, can trap Adults. 5. Chemical control In the early stage of corn filling, 50% phoxim EC can be used 100 times solution to drip liquid at the top of the ear of corn to prevent and control the damage of white beetle adult beetle. It can also treat corn borer and other ear pests.
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