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柿粉介壳虫是柿树的主要害虫之一,在我省每年因此虫为害而减产的約在30％左右。被害的果实,未熟先紅而落,影响产量和品質。柿粉介壳虫在菏澤,每年发生4代,每代的发育期長約30天,最長的冬季一代的发育期为180—190天。以具有薄层臘粉的初龄若虫,在主干上、树縫中、树洞內越冬。来年4月中旬开始活动,在嫩枝和幼芽上为害。5月中下旬,成虫交尾,产卵于卵囊內,每个雌虫平均产卵100个,最多产卵170个。卵期因溫度而有显著的变动,一般为12—21天。若虫的盛发期是在6月中旬(第一代),7月中旬(第二代),8月中旬(第三代),9月中旬(第四代),10月中旬,果实采收后,初龄若虫爬到主干上,树皮縫中,树洞內越冬。一年中以第三代若虫为害最重。在柿树芽萌动时,噴佈5％蒽油乳剂杀虫率达98％,但对植物有輕微药害。在柿树生長期,喷佈0.5—1％蒽油乳剂,或0.5—1°B′e石硫合剂(温度在35℃以上时,1％蒽油乳剂,1°B′e石硫合剂,有輕微药害。)0.5°B′e多硫化鋇液,5.5.2大蒜碱液,60倍棉油皂液,30倍松脂合剂,100倍25％滴滴涕乳剂,1000倍46.6％ E605,或50％1059,防治效果均在90％以上,但大面积防治以0.5°B′e石硫合剂为佳。
Persimmon powder scale insects is one of the major pests of persimmon trees in the province so pest damage and annual reduction of about 30%. Victims of the fruit, before the first red fall, affecting yield and quality. Persimmon powder scale insects in Heze, 4 generations occur each year, each generation of about 30 days of development, the longest winter generation of 180-190 days. To early larvae with a thin layer of wax powder, in the trunk, tree seams, the winter hole in the tree. Beginning in mid-April next year activities, damage on shoots and young shoots. In mid to late May, the adults cross each other and spawn in the oocysts. Each female averagely spawns 100 and spawns at most 170. Eggs due to temperature and significant changes, usually 12-21 days. Nymphs flourishing period is in mid-June (first generation), mid-July (second generation), mid-August (third generation), mid-September (fourth generation), mid-October, fruit harvest After the first instar nymph climbed the trunk, bark stitched, wintering in the tree hole. One year to the third generation of nymphs most affected. In the persimmon bud sprouting, spraying 5% anthracene oil emulsion insecticidal rate of 98%, but plants have a slight phytotoxicity. During the growth of the persimmon tree, 0.5-1% anthracene oil emulsion or 0.5-1 ° B’e lime sulfur mixture is sprayed (at 1% anthracene oil emulsion, 1 ° B’e lime sulfur mixture, Slightly toxic.) 0.5 ° B’e barium polysulfide solution, 5.5.2 garlic lye, 60 times cotton oil soap, 30 times rosin mixture, 100 times 25% DDT emulsion, 1000 times 46.6% E605, or 50 % 1059, the control effect is more than 90%, but large-scale prevention and control to 0.5 ° B’e lime sulfur agent is better.