Pink bollworm (Pectinophora gossypiella (Saunders)), also known as red bell Angoumois grain moth, Lepidoptera (Lepidoptera) Gelechiidae (Gelechia)., Pectinophora gossypiella (pink bollworm) the world cotton pests, but also one of the domestic and international phytosanitary object. Originating in India, after the spread to more than 80 cotton-producing countries in the world. Domestic Apart from northwestward cotton in Xinjiang and Gansu Hexi Corridor is not found, the other cotton-growing areas has occurred, but the heaviest in the Yangtze River valley, annual losses of 15% to 30%.
The pink bollworm host plants 78 species involved the Malvaceae, gastrodin Section, kapok Branch, Leguminosae, Euphorbiaceae, flax Branch, Convolvulaceae, cochlear sub Kwai Branch, Malvaceae. Larvae damage cotton Zhushi cotton bud, flower, bell, and other reproductive organs, the murder of the young bud bract yellow flared off; large bud victim even after flowering, but the larvae spit wire wrapped around the petals, the victim Corolla distorted, can not properly expand petals form a windmill flowers; falling flower petals murder caused; green bell murdered when larvae chomping tender within the bell the fiber and cottonseed, sesame size nodular seen the inside of the bell wall curved protrusions and small insects Road, causing boll rot or stiff flap; cottonseed murder the seed kernels prey empty, caused by a shell or double sub.The second on behalf of 68 of the the field chemical control reference indicators egg / one hundred, or 20 to 30 larvae / the hundred bell, took the 3 200 eggs / one hundred, or 40 to 60 larvae / 100 bell; optimum control period 1-2age of 10 billion spores per 667m2 the / ml short stable bacillus SC 80 ~ 100ml watered 40 ~ 50kg spray a fine mist. |
