Many pests and diseases occur during the growth of wheat, and the larvae are one of them. Its larvae can damage the grain being grouted. If there is a larva in the grain, it will reduce about a quarter of the larvae, and the larvae at both ends will reduce the yield by half. The four larvae will cause the granules to be rejected, which shows how devastating it is, so it is necessary to strengthen prevention and control.
Difficult to control
Adults of the wheat larvae will lay eggs on the ears of wheat from late April to early May. The egg larvae will enter the glume damage as long as the egg period is about 5 days. The best control period is only about 7 days, it is very easy to miss the best prevention and control opportunities. Once it is missed, it is difficult to prevent and cure the drugs.
Large loss of output value
When the amount of larval larva is 25,000, the output value is lost to about 10%. When the larval amount of larva is between 250,000 and 1 million heads, the loss rate of output value can reach 40%. When the larval amount of larva is 3 million, the output value is lost. The rate can reach 70% or so. When the larval amount of larva exceeds 5 million heads, the loss rate of output value will reach over 80%.
Control objectives:
The plots with more than 2 heads per square are used for prevention and control in flood season and adult stage. Other wheat areas are controlled in the adult stage and treat wheat aphids.
Prevention and treatment methods:
The combination of flood season and adult stage is the prevention and treatment criterion.
1. Prevention and control during flood season:
Kill the poisonous land. Should be grasped 3-5 days before the heading of wheat, not too late.
Application: 40% chlorpyrifos EC 500ml (plus appropriate amount of water) or 3% methyl isosulfur granules 2 kg, and 20 kg of fine sand, evenly mixed, formulated into toxic soil, evenly spread the surface in the afternoon (Be careful not to sprinkle the poisonous soil on the leaves). Sprinkle water after spraying the poisonous soil can improve the efficacy.
2, adult prevention and control:
It is necessary to grasp the field spray before the flowering of wheat and to cure the wheat aphids.
Application: 2.5% cyfluthrin EC 30 ml + 10% imidacloprid WP 20 g. Generally, it is controlled at 9:00 in the morning or at 5 o'clock in the morning. The spray should be sprayed thoroughly to effectively control the number of adult populations and the number of eggs laid.
It is not necessary to control the larvae separately. It can participate in the above formula in the prevention and control of wheat scab, powdery mildew and rust, and can also participate in the high-efficiency foliar fertilizer with the 1000-grain weight of wheat.
Precautions:
1. The control time of the larvae is severe, and the missed key period will not reach the prevention and control intention. Therefore, it is expected that the broad wheat farmers will seize the opportunity, and when the medicine is used, the prevention and control of the larvae will be ensured to ensure the high yield and abundance of wheat this year.
2, pay attention to the safety of medication, the necessary protective measures should be adopted when applying drugs to avoid poisoning.
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