What are the control techniques of grape feather moth?

Growers always say that there are many grape diseases and often ignore the problem of grape pests. In recent years, the harm of Plutella xylostella has increased year by year in the main grape producing areas, so what are the control techniques of grape moth?

1. Characteristics of Plutella xylostella

Adult: about 20 mm long, wingspan 30-36 mm, blue-black body. The top of your head. The junction of the neck, both sides of the posterior chest and each segment of the abdomen is orange, the front wing is reddish brown, the wing vein is black, the posterior wing is membranous and transparent, there are three yellow transverse bands in the abdomen, and there is a bunch of long hairs at the end of the male's abdomen.

Eggs: eggs scattered on branches, long oval, slightly flattened, reddish brown, about 1.1 mm long.

Larvae: a total of 5 instars. The length of the mature larvae is about 38 mm, and the whole is slightly cylindrical. Reddish brown head, yellow and white chest and abdomen, purplish red when ripe. The front chest and back plate has an inverted "human" shape, and the front is light in color.

Pupa: about 18 mm long, reddish brown. Cylindrical.

Harmful symptoms: the newly hatched larvae eat the tender stems from the petiole base and leaf nodes and then upward or downward; the borer is often swollen and sometimes tumorous, and the branches are easy to be broken and withered by the wind after being damaged. After the main branch is damaged, it will cause a large number of fruit drop and lose economic benefits.

Second, occurrence regularity

The grape moth produces one generation a year, and the mature larvae overwinter in the grape vines. At the end of April and early May of the following year, the overwintering larvae began to pupate. Adult Eclosion from May to June. Before the first ten days of July, the larvae were damaged in the branches of the same year, and from the middle of July to the end of September, the larvae were mostly damaged in the old vines of more than two years old. After October, the larvae entered the mature stage and continued to concentrate to the old vine and trunk of the plant, in which the pulp and xylem inner layer were eaten back and forth for a short distance. The pores are widened, and the harmful parts are expanded to form a tumor, forming an overwintering chamber, after which the mature larvae enter the overwintering stage.

III. Prevention and control techniques

The main results are as follows: 1. Combined with winter pruning, the damaged branches and vines are cut off and burned centrally in order to destroy the overwintering larvae. The withered shoots and inflated twigs were cut off from June to August. From the early and middle of June, combined with maintenance, often observe the petiole, leaf axils have yellow fine matter discharge, if found with skimmed cotton slightly dipped in 40% Tosborne 10 times solution smear. The damaged twigs can be directly injected into the 500-fold solution of Taoben, and then sealed with yellow mud.

2. Biological control: during the adult Eclosion period from May to June, a newly emerged female adult is put into a small cage made of window screen, with a small stick in the middle and placed on the mouth of the basin holding water, and the basin is placed next to the grape, which can attract many male adults every night. To lure one is to lure a pair, and the effect is very good.

3. Chemical control: when the grape is in crimping and budding stage, Jinming (3.2% methylvitamin salt ·cypermethrin ME) 2000 times solution or Jinverin (5% avermectin SC) 2000 times solution, green micro (2.5% cyhalothrin ME) 1000 times solution can be sprayed to control the grape, and the control effect is outstanding.