The insect on the edge of the vegetable field-the yellow poplar silk borer

The flowers bloom in spring and the insects begin to move. During the recent activities of science and technology going to the countryside, it was found that a pest, "boxwood silk borer", began to occur and damage on the roadside of the park.

The yellow poplar silk borer is one of the common pests in plants, such as yellow poplar, melon seed, big leaf yellow poplar, small leaf yellow poplar, sparrow tongue yellow poplar, spoon leaf yellow poplar, Korean yellow poplar, holly and so on, which occur in Shanghai and other provinces and cities. Shanghai has three or four generations in a year, and the times overlap seriously. Usually spring begins to be active in March, pupation begins in mid-April, Eclosion begins in late April, the first generation of larvae appears in early May, the first generation begins to pupate in early June, the first generation begins to Eclosion in mid-June, and lays eggs in late June. At the same time, the second generation larvae begin to appear, pupation in mid-July and second generation adults in late July. The third generation larvae appeared in early August, pupated in mid-August, the third generation adults began to Eclosion in late August, spawned in early September, overwintering larvae appeared in mid-September, and entered the overwintering stage in mid-October. The larvae of the 1st and 2nd instar feed on the mesophyll, and after the 3rd instar, they spin silk to make a nest and feed in it. The damaged leaves showed yellow withered spots at the initial stage, and then the whole leaves fell off. Silk spinning binds the leaves and the fallen leaves together, so that the leaves can not be extended, the growth and development is seriously affected, and the whole plant dies when the damage is serious. The adults are hidden during the day and active in the evening. Their flying ability is weak and their phototaxis is not strong.

In order to control the pest, it is necessary to strengthen the management in cultivation to promote its healthy development so as to increase its ability to resist diseases and insect pests. Reasonable pruning and manual hunting can remove some insect sources and improve the ventilation and light transmittance of its growing environment. Chemical control should be carried out if necessary. During the period of larval hatching to 2nd instar damage, 20% cypermethrin, 20% cypermethrin and 20% cypermethrin were sprayed at 1000-1000 times, 1000-2000 times and 4.5%, respectively.