Alisma nigiriformis is a diurnal pest of the diptera and the family Liriomyzae. It is a wide-ranging pest that eats food from the newly hatched larvae. The newly hatched larvae enter the main stem through young veins and petiole, and pectine pith and xylem. If it is not controlled in time, it will result in serious reduction of production.
1. Occurrence time Dictyostoma viviparum usually takes 4 generations a year, especially for 2-3 generations. Overwintering adults are in full bloom in early June. The first generation of larvae was at the end of June, and was ravaged by spring sowing soybeans. The adult period was in mid-July, when summer soybeans were allowed to multiply. The second generation of larvae is at the end of July and early August. Foraging is the first flowering period of soybeans, and the adult period is in mid-August, when soybeans bloom. The third generation of larvae in mid-August, the late flowering soybeans to the early puerperium, is also the most dangerous hazards; adulthood in the early September. The fourth-generation larvae were at the end of mid-September, and were endangered by late sowing soybeans and green beans.
2. Prevention and control measures (1) Agricultural control: It is necessary to use as early as possible a high-yield product, and do not mistaken for early sowing at the time of agriculture to improve the insect resistance of plants to reduce the damage. (2) Sweet and sour trapping and killing: In the period of adult growth, 375g of brown sugar, 500ml of vinegar, 125ml of white wine, 0.5g of trichlorfon and 500ml of boiling water are placed in the bowl, and the field is diluted and placed in every 20-30 mus. A pot, 6-9 am, 5-7 pm trap to reduce harm. (3) Chemical control: Primary adult and newly hatched larvae. Can use 10% Dagong Chen wettable powder 15-20g/mu or 40% Dimethoate EC 50-75ml/mu, also can use 50% phoxim EC 50ml/mu, water 50kg in the flowering stage of bean seedlings Start spraying twice and spray once every 10 days. After the summer solstice, the seedlings must be sprayed in advance to the early flowering stage, sprayed once every 10 days, and sprayed three times.
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