Four main diseases and insect pests of wheat in spring and their control methods

To do a good job in the prevention and control of wheat diseases and insect pests is an important link to win a bumper wheat harvest, and spring is an important period for the high incidence of wheat diseases and insect pests. Therefore, this paper introduces the four main diseases and insect pests of wheat in spring and their control methods.

Wheat

1. Aphids. If the wheat leaves turn yellow and white, it's the aphids. Aphids are mainly concentrated in the leaves, stems and ears of wheat and feed on wheat juice. The droppings of aphids will also pollute wheat leaves, hinder wheat photosynthesis, and then affect grain filling and reduce wheat yield.

① prevention and control index. If there are more than 500 aphids per 100 wheat plants on average, or if the proportion of wheat with aphids in a piece of land reaches more than 25%, it should be controlled in time.

Prevention and treatment of ②. Spray wheat with 10% imidacloprid wettable powder 10 to 15 grams and 50 to 75 kilograms of water.

2. Red spider. Red spiders appear from the end of March to early April, mainly by sucking the sap of wheat leaves. The symptom of the damaged wheat is that the leaf surface is covered with yellow and white spots, the spots gradually expand into patches, the leaves are yellow, and the serious wheat can not heading and wither and die.

① prevention and control index. The medicine should be used in time when 200 wheat circle spiders or 100 wheat long-legged spiders appear in a single row of 33 centimeters.

Prevention and treatment of ②. Wheat was sprayed with 73% ethyne (propargite) EC 1500 times or 1.8% avermectin EC 3000 times.

Wheat

3. Trematodes. If you find that your own wheat has shrunk grains, please note that it is possible that the larvae of trematodes have harmed the floral organs of wheat and sucked the wheat slurry.

① prevention and control index. From the end of April to the beginning of May, there are 2 pupae in a sample of wheat (10 cm × 10 cm × 20 cm), or when the adults of 2-3 trematodes can be seen at a glance at the grain filling stage, drugs should be used in time.

Prevention and treatment of ②. During the pupal stage, 5% chlorpyrifos granules of 600 kilograms and 900 grams and 20 kilograms of fine soil were mixed evenly, or 300 milliliters of 40% phoxim EC was mixed with 1 kilograms of water and then mixed with 20 kilograms of fine soil, spread evenly along wheat ridges, and watered immediately after sprinkling late mixed soil, which can improve the control effect.

4. Wheat leaf wasp. When the larvae feed on the leaves, the symptom of wheat is that the leaves are notched, and only the main veins are left in severe cases.

① prevention and control index. Medicine should be used when there are 40 larvae of wheat leaf wasps in every square meter of wheat field.

Prevention and treatment of ②. Before the 3rd instar of the larvae, the wheat was sprayed with 30-50 ml of 50% phoxim EC and 50 kg of water.