Four soybean leaf-eating pests should be early defense


Bean larvae

Judging from the symptoms of sampling in the field, there are four main types of soybean pests that eat leaves:

Two jumpers are also called two yellow leaves early. The adult is a small yellow beetle with a black stripe in the center of the front wing, which occurs 3 to 4 generations a year. When soybean seedlings are killed, they eat round holes of different sizes on the true leaves. In addition to the damage to the leaves, the adult stage is also harmful to the pistil, resulting in less pods. The adult also eats the epidermis and tender stems of the green pods, often showing black shallow holes. 50% phoxim emulsifiable concentrate can be used, 75~100ml per acre or 4ml per acre of 2.5% bisulfan emulsifiable concentrate, sprayed with 40~50kg of water respectively, and can also be killed by 50% sin cyanide EC 2000 times. Off.

The bridge-building insects mainly include Spodoptera litura, Sophora dahliae, and Spodoptera litura. The larvae, also known as step worms, occur in three generations a year. Their mixed populations are in full bloom from early July to late September. Adults have phototaxis and many dormant nights. They lay eggs in the dense soybean fields and have many eggs. Attached to the back of the leaves on the middle of the bean strain. The larva bites the soybean leaves into irregular holes, which are more bitten into nicks, and some leave only the veins on the leaves, causing the soybeans to fall into the pods and the seeds are difficult to fill. When there are more than 5 larvae in soybean, it should be promptly used for drug control. The application time should be before the larva 3 years old. One can use 80% dichlorvos EC, two can use 20% fenpropathan EC, and the other can use 20% dimethoate. Four can be sprayed with 45% malathion EC by 1000~1500 times.

Bean hawk moth (also known as bean moth) is often affected by climate for 1 to 2 generations a year. Adults move to dawn at the evening, and the eggs are mostly produced on the back of the bean leaves, one leaf per leaf. The young larvae can be self-suspended, have backlighting, lurk during the day, and start to eat leaves at night. It can be harmful all day long on cloudy days. As the age increases, it can kill the leaves and leave only the stalks, causing large The output is reduced. Before the larva 3 years old, one can use 1000% phoxim emulsifiable concentrate 1000 times solution, and the other can be sprayed with 90% trichlorfon emulsifiable concentrate 700~1000 times.

The night moth usually occurs 2 generations a year. When the larva damages the soybean leaves, the young larvae are used to silking the young leaves of the soybeans. The larvae above 3 years old do not roll the leaves, and the leaves are eaten into holes or nicks. During the eclipse period, the middle and upper leaves of the soybeans in the field can be eaten up. lost heavily. Once the insect is found to be harmful, the prevention and treatment should be timely and fast. One can use 80% dichlorvos EC, the other can use 90% trichlorfon crystal, three can use 2.5% deltamethrin emulsifiable concentrate, and the other can use 20% fenproate emulsifiable concentrate. Spray 30~40 kg of water.

(Yu Hongzhang)

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