Control measures of vegetable striped flea beetle
The suitable temperature for the occurrence of flea beetle is 2 1-27℃, which is lower than 18℃ or higher than 28℃, and the adult activity is less.
There are two peaks in late spring, early summer and autumn every year. The first peak is from early April to late May, and it appears lightly from June to August due to high temperature, and reappears in mid-September due to cool temperature.
The weather in Guangdong is between 20-30℃, accounting for about 2/3 of the whole year. Cruciferae vegetables are planted in a large area, which is suitable for the reproduction of flea beetle, and it is the most serious area of occurrence and resistance of flea beetle in China. In addition, the resistance to flea beetle in Shouguang and Shenxian areas of Shandong Province is also very serious.
I. Agricultural control measures:
1, irrigation is convenient for the field, and larvae are killed by irrigation.
2. Lepidoptera longipes likes cruciferous vegetables, and rotation with other vegetables can effectively reduce its harm. .
3. After the previous crop of vegetables is harvested, remove the sick and weeds in time; 5-7 days before planting, turn over the soil or sprinkle white lime to reduce the population base.
Second, physically trap and kill adults.
Using the phototaxis and yellow color of the adults of striped flea beetle, yellow boards were hung in the field to attract pests such as striped flea beetle. Generally, 20-30 pieces are set per mu, and they are replaced every week or so 1 time.
Vibration frequency insecticidal lamps shall be installed at intervals of 70-80 meters in cruciferous vegetable crop planting areas, and the lights shall be turned on from the beginning of May to the end of 10, and attention shall be paid to prevention and control within the range of 10 meters from the light source.
Third, chemical pesticide control.
1, soil treatment.
Before sowing, turn over the ground in the sun and spray pesticide granules for controlling flea beetle, such as 0.05% dinotefuran granules and 1% bifendazim granules, which can kill flea beetle larvae and adults in the soil well.
If pesticide particles are not used, the effect of root irrigation with 42% high fluorine clothianidin suspension and 5% lufenuron or Beauveria bassiana suspension is also better after the emergence of vegetables.
Clofenuron can kill larvae and eggs, and two kinds of microbial pesticides can make adults and larvae of flea beetle die of diseases and continue to infect, thus controlling the occurrence base of pests.
2. Pesticide control began at the early stage of striped flea beetle.
Insect control should be carried out before large-scale outbreaks. At this time, it is difficult to completely control the symptoms rather than the root cause.
3, spray combination
Where conditions permit, spray pesticides on the ground before spraying, and then apply pesticides half an hour later, forcing the flea beetle to drill out of the ground before spraying pesticides.
4, frequent dressing change, combined medication.
According to local medication habits, avoid using commonly used local drugs and choose drugs with less drug resistance.
Insecticides such as dinotefuran, acetamiprid, pyridaben, deltamethrin, pyrethroid, thiamethoxam and lufenuron can be sprayed in the field, which can be mixed or used alternately, but not alone, and the same drug cannot be used repeatedly.
Contact poisoning is combined with stomach toxicity, and drugs with different mechanisms are often switched. Frequent dressing change has obvious effect, which greatly reduces the problem of drug resistance.
5. When filling and spraying, add pesticide additives such as plant essential oil.
The adhesiveness and permeability of the liquid medicine are enhanced, and the drug effect is greatly improved.