茶园绿盲蝽防治指标研究

Apolygus lucorum in Tea Plantation:Control Index

为解决绿盲蝽严重为害春茶、防治指标空缺的问题,根据田间绿盲蝽若虫为害特征,对若虫的田间计数方法进行研究;利用田间试验,测算在不同绿盲蝽虫口密度下茶鲜叶的经济损失率,并结合日照茶区绿盲蝽防治费用和茶鲜叶收益分析,确定日照茶区以虫口密度为测度的绿盲蝽防治指标。结果表明,绿盲蝽在茶丛的活动范围,受到鲜叶密度的影响。鲜叶密度大的茶园,一般在小范围内取食;鲜叶密度小的茶园,在略大的范围内取食。但是无论哪种茶园,其取食活动的茶丛横向范围都在一个不超过直径70 cm的圆内。采摘单芽的区域,绿盲蝽防治指标应为0.99头/千梢;采摘一芽一叶的区域,绿盲蝽防治指标应为1.08头/千梢;采摘一芽一二叶的区域,绿盲蝽防治指标应为1.48头/千梢。以田间绿盲蝽虫口密度为测度的防治指标,具有很高的准确性,为防治费用和茶鲜叶收益与日照类似的茶园提供了科学依据,但由于绿盲蝽若虫田间一般呈聚集分布,且刚孵化若虫虫体较小、生活较隐蔽,不易被发现,应采取多次观察计数的方法,确定虫口密度。

To solve the problem that the spring tea is seriously damaged by Apolygus lucorum while we lackrelated control index, the field counting method of nymphs was studied according to the damage characteristicsof A. lucorum nymphs. We conducted a field experiment to measure the economic loss rate of fresh tea leavesunder different population densities of A. lucorum. Combining the economic loss rate of fresh tea leaves withthe cost of control and fresh tea leaves benefit, the control index of A. lucorum could be determined withpopulation density as a measure in Rizhao tea area. The results showed that： the activity range of A. lucorum intea bushes was affected by the density of fresh leaves; the feeding behavior of A. lucorum usually occurred in asmall range if the density of fresh leaves was relatively high; on the contrary, they would feed in a slightly largerange; but no matter what kind of tea garden it was, the feeding activities of A. lucorum was within a circlewhose horizontal diameter of the tea bushes was no more than 70 cm; the control index of A. lucorum should be0.99 pests/1000 tips in the area to pick single bud, 1.08 pests/1000 tips in the area to pick one leaf and onebud and 1.48 pests/1000 tips in the area of picking one leaf and two buds. The control index with thepopulation density of A. lucorum as a measure has high accuracy. It provides a scientific basis for the teagardens whose control expenses and fresh tea leaves income are similar with Rizhao＇s. However, A. lucorum nymphs are generally in an aggregate distribution, always live in seclusion and newly hatched nymphs are too small to be found easily, we should take multiple observation counting methods to determine the populationdensity.