Wheat white-billed weed control
Living habits and damage characteristics: larvae began to damage in the turning green period of wheat, night and day, daytime silk knots hidden in the roots or between the earth seams, out at night to feed, eat wheat seedling stem base and leaves to form holes, Severely damaged wheat seedlings were snapped off by the roots, resulting in the breakage of wheat stems or the lack of leaves. As a result, the wheat seedlings wilted and died, resulting in serious failure of the 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. Occurrence pattern: The survey found that in late February, there have been symptoms of damage in the field, and the occurrence of plots has been distributed in a patchy pattern, and the extent of occurrence has been lighter. After mid-March, as the temperature rose, the larvae began to grow and develop, and the amount of feeding increased. The degree of damage began to increase. At this time, the field was mainly 2-3 instar larvae. After April, when wheat entered the green period, most of the field larvae developed into 4th instar larvae, and some of the serious plots had already been eaten up or had died due to being bitten off the base of the stalks. In the middle and late April, the main larvae of the fourth and fifth instars were in the fields, and the severely damaged plots became wasteland. Control technology: (1) Dosing method Indoor virulence tests and field efficacy trials showed that chlorpyrifos and phoxim had a strong insecticidal activity against this worm and had the best field control effect. It was the first choice for chemical control of this insect in the field. Since the worm was hiding in the soil seams of the stem base of wheat during the day and climbed out to feed at night, it was recommended to use an irrigation method to apply the pesticide. With water irrigation: use 48% chlorpyrifos, 200-250ml/mu, poured into the field when poured. Medication time can be selected during the pouring of spring water. Sprinkling with wheat seedlings: You can unscrew the sprinkler or spray it directly with a straight sprayer. The agent can use 48% chlorpyrifos 60ml/mu, or 40% phoxim 70ml/mu. The volume of liquid should be large to ensure penetration of wheat roots. Place to hide. The period of application can be selected during the returning green period of wheat. After the wheat returns to green, the insect pests will increase their food intake, 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. In Laizhou, the temperature began to rise at the end of March, and wheat was in the early stage of returning green crops. Since then, larvae have begun to increase their feed intake and enter the period of their damage. This is the best time for prevention and control. (2) Toxic soil method Before the autumn sowing of wheat, soil treatment with phoxim or chlorpyrifos granules can effectively control the occurrence of white-billed weevil. The treatment method is as follows: 5% phoxim granules per mu 2kg, or 3% phoxim granules 3 ~ 4kg, fine soil 30 ~ 40kg mix well, open ditch application or shun ridge application, plan and cover soil; or Mu with 5% chlorpyrifos particles, 0.8 ~ 2.5kg, applicator. The results of the pilot survey showed that the worst-affected wheat fields in Laizhou in 2012 were treated with poisonous soil during autumn sowing. In 2013, the disaster situation was significantly reduced compared with 2012. (3) Seed treatment The seed dressing method is: 50% phoxim 20 ml, watered 200-300 ml, mixed with 10 kg of wheat seed. However, after investigation and investigation, it was found that the seed dressing method was not as effective as the poisonous soil method for controlling the white-billed wild grasshopper. (4) Agricultural measures After the wheat and corn are harvested, timely removal of field straw, wheat bran, weeds, etc., can be applied to the wheat field to apply straw decomposition agent to remove wheat stubble as soon as possible to reduce surface cover and deteriorate the living environment of pests. Because the insects have summer diapause habits, the mature larvae of the endemic larvae diapause at the surface of 2-3cm, so they can implement farmland management measures such as deep plowing, smashing and other farmland management measures when harvesting wheat and switching to corn. The earthworms are exposed on the surface of the earth. According to investigations, the bare soil exposed to the earth's surface cannot resist the extremely high temperatures at noon in the summer. Most of the larvae that are exposed on the surface of the earth's soil are dying. Disposable Long Arm Red Veterinary Gloves Long Arm Red Veterinary Gloves,Disposable Red Soft Glove,Long Arm Veterinary Gloves,Color Long Arm Gloves Jinan Mucho Commercial Inc. , https://www.muchovet.com