Summer Soybean Grasshopper Prevention Measures

October 25 14:04:30, 2022

In recent years, due to changes in climatic conditions, grasshoppers have risen from the secondary pests of past summer soybeans as the main pests. The newly hatched larvae fed the leaves of the young leaves and had residual epidermis. After 3rd instar, the food intake increased greatly. The leaves were eaten as nicks and only the leaves were left. In general, the annual output is reduced by 10 to 15%, and in severe years, the output is reduced by 20 to 30%, which poses a serious threat to soybean production. Grasshoppers can occur in Henan one to two generations a year, and mature larvae live in silky soil. Overwintering larvae emerged from April to May. The first generation of larvae mainly harm rape. The second-generation larvae infested soybeans in late August and early September. Adults have a clustered nature and have strong tropism for a variety of light sources, especially for black light lamps. Eggs are prolific in plants such as Liko, Asteraceae and Solanaceae. The larvae have large food intake during the 4th and 5th instars, accounting for more than 80% of the larvae's total food intake.

I. Agricultural control

During the spawning period of the grassland, before the end of hatching, weeds are removed from the fields and the ground, and the shoveled grass is collected and buried. In the year of the turfgrass plague, the larvae were digging and controlling the insects before they entered the field, and the ditch could be administered with pesticides.

Second, chemical prevention

1, fumigation in the mid-August period of adult emergence, with 80% of dichlorvos 100 ~ 150 grams mixed with sawdust and wheat bran 4 kg, 40 piles per acre, evenly piled under the soybean tree, generally can maintain the efficacy of 8 to 10 days .

2. 7 to 10 days after the spray adult emergence period, which is the larval hatching period. The larvae are in the low-instar stage. Generally from late August to early September, 50% of the larvae are used to kill 25-35 milliliters of eucalyptus oil per acre; 2.5% of the enemy Kill 20 to 30 ml of emulsifiable concentrate, kill 20% to 30 ml of 20% dicamba, and dilute evenly with 50 kg of water.

3, dusting 2.5% trichlorfon powder; 3% mixed Granville powder; 2% acaricidal pine powder, spray 1.5 to 2 kg per mu.

Third, physical control in the bean field erected black light, trapping adult.

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