Grape Hummer, also known as smoke thrips. In recent years, there has been an increase in the damage of grape production areas throughout China. How to properly prevent the harm of thrips, recently, Zhang Zongqin, an associate professor at the College of Forestry of Northwest Agriculture and Forestry University, provided scientific guidance for the majority of fruit farmers.
Harmful symptoms
Zhang Zongqin said that the harm of thrips on grapes is mainly due to the nymphs and adults sucking young fruit, young leaves, and juice from new shoots. Grape young fruit is not discolored when it is killed, but the next day, the damaged parts will lose water and shrink, forming a small dark spots, affecting the appearance of fruit, reducing the value of the goods, causing severe grape fruit cracking. Victims of leaves will first appear greenish yellow spots, the latter leaves become smaller, curly deformed, dry, and sometimes perforation. The growth of damaged shoots is inhibited.
Occurrence
The selectivity of different varieties of grape varieties in the thrips is related to whether the content of tannins, flavonoids and waxes in the leaves of the grapes is significant or not.
Hummer is 3 to 4 generations in North China, 6 to 10 generations in Shandong, and more than 10 generations in South China. The adult insects or nymphs of the pests will live on unharvested onions, garlic sheaths, weeds, and stubbles, and a few of them will live in the soil. Spring onion and garlic turn green to resume activities. After a certain period of time, they fly to fruit trees, cotton and other crops for breeding.
Adult thrips are active, able to fly, spread quickly, hi to hide in hidden places during the day, and damage on leaves at night or on cloudy days. Multiple lines of parthenogenetic males are rare. Eggs are prolific in the subcutaneous leaf veins or veins, egg period 6 to 7 days. The newly hatched nymphs are less active and are mostly concentrated on the sides of the leaf veins on the back of the leaves. During the same period from July to August, various forms of insects were observed. In September, the amount of insects was significantly reduced. Before the advent of early frost in October, a large number of horses moved to vegetable fields such as onions, garlic, cabbage, and radish near the orchard.
Control methods
Zhang Zongqin reminded the majority of farmers that prevention and control of thrips need to remove weeds and litter in the orchards in winter and spring, and eliminate the damage to the insects from September to October and early spring to eliminate the damage caused by onions and garlic.
In addition, the farmers should pay attention to spray control during the flood season. The larval period can be sprayed with 2000 times of 20% fenvalerate EC and 3000 times of 5.5% of AVS, or 1500-2000 times of 40% of acetamiprid. Appropriate use of drugs according to hazards 2 to 3 times, each medication interval 7-10 days.
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