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一、甲口虫的危害及习性目前,枣树花期“开甲”即环状剥皮仍是河北、山东金丝小枣、冬枣产区普遍应用的重要的枣树增产措施之一。金丝小枣如果不开甲,全树只零星坐果.产量甚微,而开甲后,坐果率可提高40倍以上,产量提高20倍以上,其它枣树开甲后也可提高产量20%～110%。但是,枣树开甲后,又常常遭受灰暗斑螟,俗称枣树甲口虫的危害。该虫以幼虫危害枣树甲口和伤口,造成甲口不能完全愈合或甲口上下韧皮层完全断离,被害树树势迅速转弱,枝条干枯死亡,果实产量和品质显著下降,重者1～2年整株死亡。根据调查,不进行甲口保护的开甲枣树,被害率可达76%,年均死亡株率0.5%,甚至更高。
First, the harm and habits of the claw insect At present, the flowering date “open arm ” that is ring-shaped peeling is still Hebei, Shandong golden date jujube, jujube production areas commonly used important one of jujube production measures. If the jujube not open arm, the whole tree only sporadic fruit production is very small, and open armor, the fruit setting rate can be increased by 40 times, the yield increased by 20 times more, other jujube open armor can also increase the yield of 20% ~ 110%. However, jujube tree after a, often suffer from gray moths, commonly known as jujube worm. The insect larvae endanger the jujube mouth and wound, resulting in a mouth can not be completely healed or the upper and lower mouth of the phloem completely broken off, the victim tree quickly weaken, branches dead death, fruit yield and quality decreased significantly, severe 1 ~ 2 years whole plant died. According to the survey, do not carry out the protection of the mouth A jujube tree, the victimization rate of up to 76%, the average annual death rate of 0.5%, or even higher.