Occurrence and Control of New Wheat Pests--Brow and Wild Grasshopper
White-billed wild pheasant is a new pest that injure wheat and is a serious pest that can cause wheat crop failure. Currently only known to be distributed in Shandong and Shanxi.
Damage characteristics
The larvae began to infest in the turning green period of wheat, and they were nocturnal during the day. During the day, the silky knots were hidden in the roots or in the earth seams. They came out to feed at night, and they bitten the bases and leaves of the wheat seedlings to form holes, and the severely damaged wheat seedlings were caught. The roots snapped off, resulting in the breakage of wheat stems or the lack of leaves, resulting in wilting and wilting of the wheat seedlings, which severely caused the lack of seedlings. With a strain of the strain as a habit, Shun Hao damage, hi dark. The old larvae are lively and have no suspended animation. They are frightened and retreat. There is summer dyspnea habits and long duration of diapause. Adults tend to light, eggs scattered production, there is a trend of aggregation. Its damage symptoms are similar to those of common underground pests such as two-pointed caterpillars and ground tigers, and are easily confused.
Prevention
1. Agricultural control. After wheat and corn are harvested, crop straw, wheat bran, weeds and other coverings shall be promptly removed. If necessary, straw decomposition agent may be applied to wheat fields to remove wheat stubble earlier, reduce surface cover, and deteriorate the living environment of pests.
2. Sowing period control. (1) Toxic soil method. Before planting wheat, use 5% phoxim granules per acre 2 kg, or 3% phoxim granules 3 ~ 4 kg, add fine soil 30 ~ 40 kg mix, open ditch application or Shun ridge application, and then Cover soil; or use 5% chlorpyrifos granules 0.8-2.5 kg per acre, spread. (2) seed dressing method. Before wheat sowing, use 20% of 50% phoxim EC, dilute 200-300 litres of water and mix 10 kg of wheat.
3. Growth period control. After the return of green wheat, the food intake of the larvae will increase, and the damage will increase, which will easily lead to the lack of seedlings and ridges. This is a critical period for the prevention and control of pesticides. According to the preliminary field control and pesticide screening tests, the white-billed wild grasshopper is sensitive to chlorpyrifos and phoxim, and is the first choice for field control. (1) Dosing method. With water irrigation: When wheat is spring-filled, use 48% chlorpyrifos EC 200-250 liters/mu, ready to pour into the field; Sprinkling wheat seedlings: In the turning green period of wheat, unscrew the sprayer nozzle, use 48% chlorpyrifos EC 60 liters / Mu, or 40% phoxim 70 liters/acre, watered with sprinkler plant roots. The amount of the liquid to be sprayed is large to ensure that the liquid penetrates into the place where wheat roots enclose the pests.
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