The black-headed plague is the larvae of the late-spotted larvae, belonging to the family Diptera, Oraloptera, and is typically characterized by its blackish blackheads.
One, late eye damage
Late-infested mosquitoes are mainly harmful to leeks, scallions, onions, shallots, garlic, and other liliaceous vegetables. Occasionally, they also harm lettuce, vegetables, celery, etc., distributed in Beijing, Tianjin, Shandong, Shanxi, Liaoning, Jiangxi, Ningxia, Inner Mongolia, Zhejiang, Taiwan and other places.
Second, field factors that cause late-spotted mosquito harm
1. Humic Health
In agricultural cultivation, many producers do not deliberately notice whether they are completely decomposed when using organic fertilizers. Frequent use of unprocessed organic fertilizer or accumulation of unfermented feces, which led to the breeding of blackheads. After the raw organic fertilizer is applied to the soil, the protozoa cannot be decomposed rapidly. At this time, it is necessary to assist the decomposition of epigenetic organisms. The black-headed earthworm is a best helper.
2. Smell attraction
After the leeks cut, the liquid will flow out of the wound. The odor and odor generated by the liquid rot will attract the adult larvae of the larvae and cause damage to the larvae.
Third, late-spotted mosquitoes occur
Late-infested mosquitoes occur 4-6 times per year in Tianjin, Beijing, and Hebei. The mature larvae lived in dormant state in soils with 3-4 cm depth around bulbs such as leeks and garlic or in the rhizosphere. There is no overwintering phenomenon in the protected areas and breeding can continue.
In the spring of the following year, pupa began in late March and early April, and became adult in April. This is a crucial period for the prevention and control of adult worms throughout the year. The first generation larvae were in late April-May, the second generation was in June, the third generation was in July, and the fourth generation was adultated in October-April. In the vast north of the country from April to May, it is a crucial period for the control of adult and larvae.
In the actual production, the prevention and control of adult worms is the key to control overwintering adults. The prevention and treatment time is in the middle or late April. The larvae are mainly controlled by the spring and autumn. Successful control in the spring can reduce the damage of the whole year, and the prevention and treatment in the fall can reduce the number of overwintering populations. The larval control period is in late April, early May and late October. Due to the difference in the time for sheltering, the protection period must be determined through pest investigations. The following measures can be taken to prevent and control it.
Fourth, late eye mosquito control
(1) Clean garden: The use of high-quality organic fertilizer, the farm manure must be fully decomposed, can be mixed with 20kg of lime powder in each cubic meter of organic fertilizer.
(2) Control of adult worms: In adult eclosion stage, spray with 4.5% beta-cypermethrin EC 1500-2500 times. Spray at 9-10 am, 10d1 times, spray 3-4 times.
(3) Controlling larvae:
Mixing soil:
Imidacloprid (70% imidacloprid wettable powder 30-40 g/mu, 50% imidacloprid wettable powder 40-60 g/mu, or 10% imidacloprid wettable powder 200-300 g/mu) 2% imidacloprid granules 1000-1500 g/acre;
Chlorfluazuron (50 g/l chlorfluazuron EC 200-300 g/mu);
Beauveria bassiana (15 billion spores per gram of Beauveria bassiana granules, recommended dosage is 75-90 g/mu)
Irrigation:
Use 20% Acanthamoides & middot; Phoxim EC 500-750 g/mu or 70% Phoxim EC 350-550 g/mu Irrigation or 50 g/L chlorfluazuron EC 100-200ml/mu Watered Irrigation .
Or choose to use ozone water 10-20 mg/L for direct irrigation during larval and flood seasons.
In addition, according to recent trials, the application of 250,000 head/K. nematophila powders according to a dosage of 400 g/mu will also exert a better control effect on the population of earthworms. In the suburbs of Beijing, after the beginning of May, the ground temperature stabilized at 20°C and the roots should be applied.
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