Aphid Occurrence Larger Watermelon Virus Disease Recurrence

Wufenghua, Daimiao Town, Zangshui County, said on May 9 that he had a recent viral disease in his 50-plus mu of greenhouse watermelon. The diseased plant vines grew slowly or did not grow. The top leaves became smaller, deformed, and shrunken. The rate of diseased plants reached 50%. The watermelons in these plots are in a period of enlargement, and the melons have a weight of 1.5-2 kg. It is understood that there were more locusts in the field in the past, and there was no locust in the field after fumigation with dichlorvos. He asked if there is any medicine to prevent watermelon virus disease. In recent days, readers of Anhui, Dongtai and other places have also telephoned to reflect similar situations.
Viral disease is the main disease on watermelons, and the incidence of serious reduction after onset. The complex infection of the disease is widespread, and the types of symptoms are complex and numerous. There are mosaics, shrinkage, yellowing, chlorosis, linear leaves and ecchymosis. Leaf curling, etc., with few symptoms. Comprehensive performance: At the beginning of the disease, bright veins appear on the new leaves. As the disease progresses and the plants grow and develop, the top tender leaves are dark green, light green and white mottled mosaics, some appear verrucous or shrinkage deformity, and some have small leaves. Severe fern leaf or chicken claws. The melons of the diseased plants are small, the quality is declining, and sometimes the melon surface is uneven. The serious diseased plants do not have melons, the stems and internodes are shortened, and the plants are dwarfed.
The main virus types that occurred on watermelon were watermelon mosaic virus 2, melon mosaic virus, cucumber mosaic virus, cucumber green mosaic virus, etc., which was infected with watermelon mosaic virus 2 and cucumber mosaic virus in our province. Mainly. Watermelon virus disease is mainly caused by the transmission of poisonous aphids in the field. Rainfall directly affects the activity and breeding ability of the aphids. The amount of aphids and rainfall in watermelon seedlings are the key factors affecting the prevalence of watermelon virus diseases. Less rainfall during the seedling stage, a large amount of aphids, and heavy onset; on the contrary, the incidence is light. This spring, the weather in our province is arid. The occurrence of locusts in most areas is very large, which can easily lead to the occurrence of watermelon virus disease. The large amount of aphids that preceded the above-mentioned watermelon field may be a major cause of serious viral diseases.
After the viral disease of watermelon, there is no cure for it. After the onset of the onset of production, morphine chloride, copper acetate, ribavirin, and ninnanmycin, which are commonly used for viral inactivation, can only relieve symptoms and have no radical effect. The most critical measure for preventing and treating watermelon virus disease is to treat locust control disease. The main medicines for controlling aphids in watermelon include acetamiprid, imidacloprid, nitenpyram, and pymetrozine.

The Laser Distance Meter is precise measuring tools with high accuracy and 100m long distance. The laser distance measurer can be used indoor and outdoors. It's widely used in many areas, specially in construction industry, thanks to the IP54 dust and water resistant. The digital height measurement device
Why Our 100m Laser Distance Measurer?
1. Long range: 0.03-100m. 
2. High Accuracy. The accuracy can achieve ±1.5 mm.
3. Multiple Functional Designs: can be used to measure distance, area, volume, angle, and Pythagorean measurement. Also can add function: Bluetooth, USB charge, voice, touch screen etc.
4. IP54 waterproof rating and dustproof

Laser Distance Measurer 100M

Laser Distance Meter 100M,Laser Meter 100M,Laser Measure 100M Range,100M Laser Distance Meter

Chengdu JRT Meter Technology Co., Ltd , https://www.cdlaserrangfinder.com