Recently, the greenhouse shed growers in the Linzi District of Zibo City discovered that some of their zucchini plants in the greenhouse have shrunk and clumped, the heart leaves have not been able to stretch, the young larvae have grown slowly, and the leaf color has become lighter.
The author carefully observes and analyzes the scene and believes that it is a large humming horse. It is very difficult for the big tamper horse to see with the naked eye. The worm body is only 1.4-1.5 mm. Adults, or nymphs, accumulate on the heart leaves and young leaves, causing the heart to fail to stretch, the growing points shrinking, and the hair hard. The pests not only harm crops such as melons, beans, cabbages, tomatoes, and peppers. In the middle and lower reaches of the Yellow River, 6 to 7 generations a year occur, and adults spend winters in cracks on the back or stems of onions, garlic, and radishes. The second year occurred in the protected area in the middle and early March (exposure occurred in the middle and late April), and the generations overlapped. Adults and nymphs inhabit the back of the flower or the back of the leaf during the day, and they move quickly. They spawn in the calyx or flower organ, and the nymphs drill into the topsoil of the topsoil. The nymphs first become pre-cockroaches, and then they reinfest the clams, and they emerge into adults one week later. It is relatively cold to go to winter and this spring. There are more shades, fogs, and snow days. Compared with the normal light in February, it is only 1/3 of the normal year. It is relatively less in watering management than in previous years, resulting in a large number of horses. Great happening.
Preventive measures: It was found that the silkworm large horses in the greenhouse must be sprayed in time 3% Yunda acetamiprid 1500 times, or 10% to eliminate 2000 times the suspension agent, or 2% avermectin EC 2000 times spray . For the relatively dry soil in the greenhouse, small water can be poured and flushed with chitin to increase the air humidity and promote root growth. After mid-March, the watering interval is 5 to 7 days/time. The 15~20 kg mu/ternary compound fertilizer should be applied along with the water. If the melons grow, the high-potassium, low-phosphorus, and medium-nitrogen (N:P:K,10:6:25) compound fertilizers will be applied to improve the late stage. Yield.
Intestinal localization was administered to reduce adverse effects.
Targeted site-specific release:
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