How to control diseases and insect pests when planting alfalfa in autumn and winter?

Alfalfa is the earliest and most widely distributed perennial leguminous forage in the world. It not only has high yield, good quality and high nutritional value, but also is resistant to cold and drought, barren, adaptable and suitable for planting in a wide range. It is the first choice for increasing milk yield of dairy cows and developing beef industry.

Under the policy of "changing grain to feed" in China, many farmers have begun to join the planting army of alfalfa, so how to control diseases and insect pests of alfalfa in the following autumn and winter?

1. Stubble after autumn

After harvest in autumn, some germs will overwinter on the stubble on the surface. Stubble treatment in this period will eliminate a large number of diseases and insects and reduce the infection coefficient in the coming year.

2. Targeted grazing

For diseases and insect pests that are easy to eliminate, alfalfa stubble can be grazed to eat, eliminate and carry out pests and germs.

3. Burning stubble

Burning stubble is more effective for the eradication of diseases and insect pests, but attention should be paid to fire prevention.

4. Winter irrigation

Winter irrigation can worsen the living conditions of diseases and insect pests, inhibit or kill diseases and insect pests, which is beneficial to alfalfa overwintering and turning green in the following year.

5. Pesticides to control diseases and insect pests

Spraying pesticide + new high-fat film on the surface after autumn harvest can effectively prevent all kinds of diseases and insect pests and minimize the pesticide residues in alfalfa products in the coming year.

Generally speaking, the common pests of alfalfa are aphids, blind stink bugs, leaf miners, etc., which can be controlled by spraying 1000 times of water with 40% dimethoate emulsion or fenvalerate. The common diseases of alfalfa include powdery mildew, downy mildew, rust, brown spot and so on, which can be controlled by carbendazim and methyl topiramate.

Known as the "king of pasture", alfalfa is currently an "online celebrity in the agricultural planting community". In general, an acre of alfalfa can raise 12 to 15 sheep. Nowadays, the policy is good, and farmers are recommended to plant it.