High cucumber temperature in greenhouses
Recently, the newspaper’s agrochemical expert Zhang Lining’s teacher visited the cucumber sheds in Jiyang and Shanghe County in Shandong Province. He found that the greenhouse cucumbers suffered severe damage from thrips, where the growing point shrank, the leaves curled, and the growth stagnated. It is difficult to distinguish between the horse and the horse at the time of the start of the thrips. Therefore, it is easy for the vegetable farmers to treat the thrips as a cucumber green mottle virus disease. Because of a misdiagnosis, the medicine is not symptomatic, and the control effect is not achieved.
When talking with vegetable farmers, Mr. Zhang Lining discovered that some vegetable farmers had a misunderstanding that they thought they should only occur in the hot season. Therefore, in the cold season, the degree of damage to the greenhouse thumps was often underestimated, and insufficient attention was paid to understanding the symptoms of the damage. clear.
Teacher Zhang Lining pointed out that the higher temperatures in the warm winter greenhouses have created a good living environment for Hummer. Hummer harms cucumbers and leaves cucumbers with chlorosis and yellow spots. Some cucumbers have undesirable symptoms such as slender waist, big head, and peel rust. After the melons were damaged, the melon strips were stained by insects. Sometimes black thrips can be found in the flower buds of cucumbers.
Hummer horses that endanger cucumbers are mostly jaundice horses, and yellow pods use sap from young shoots, young leaves, flowers and young larvae of adult cucumbers and nymphs to grow cucumbers. After the cucumber is killed, the heart leaves do not expand normally or even dry without buds. The buds or young leaves shrink or curl, and the tissues become hard and brittle. Plants grow slowly, internodes shorten, and there are clusters. After the young melon suffers, the fruit is hardened, deformed, and the hair grows grayish brown or black-brown. The growth is slow, the peel is rough, and the skin is covered with "rust", and when it is severe, the fruit is dropped. In the case of cucumbers that are damaged by thrips, the leaves are prematurely aged, brittle, and curled and look like cucumber green mottle virus disease.
The weather has not yet entered the deep winter. The temperature in the greenhouse is very high, especially at noon, and with the high temperature management of cucumbers on weekdays, the temperature in the shed during the day is about 32°C. This temperature is suitable for the growth and development of thrips. . Professor Zhang Lining said that in the shed he investigated, it was found that the size of the occurrence of the hummer horse was not small, and the average shed strain rate was 15% to 30%. Individual sheds also tended to occur. Therefore, it was necessary to draw the attention of the majority of vegetable farmers. The greenhouse should still pay attention to the prevention and control of thrips, so as to avoid causing major losses. The following measures can be taken to control thrips in greenhouses:
1. Physical control. Hang the blue plate to seduce the adult, hang a blue plate about every 10 meters, slightly higher than the cucumber growth point 15-30 cm, in order to reduce adult oviposition hazards.
2. Chemical control. Choose agents that are effective against sucking mouthparts, such as 25% imidacloprid WP 2000 times or 5% acetamiprid WP 2500 times or 2.5% Vegetable HX 1000-1500x or 25% A Ke Tai water dispersible granules 5000-6000 times, uniform spray, 5-7 days once, alternating 2-3 times.
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