Bean green worm is a kind of crop pests. It often occurs in the summer season. According to Xiaobian, it is currently the soy seedling stage. At this time, it is also the most likely time for bean budworms to occur. Every grower must pay attention, otherwise it will be serious. The effect of soybean growth.
In summer, the temperature is high, the rain is high, and insects are prone to insects. In June, when the official larvae are active, the following are detailed symptoms and control techniques of the bean worms.
First, the symptoms of bean worm
Living habits.
Adults are active during the day, with the highest activity at noon on sunny days, with a life span of 2 to 5 weeks. Spawning has a strong tendency to cruciferous vegetables, especially the thick-leaf cabbage and broccoli have large egg masses, which are prolific in the back of the leaves in summer and prolific in the front of the leaves in winter. The eggs are scattered, the larvae are slow and inactive, and when they are mature, they climb to the high dryness and are not easy to soak in the water. In the non-overwintering, they often lick the back of the leaves or the petiole at the bottom of the plant, and the silk is entangled in the attachment. It is a special feature.
Mainly for cruciferous vegetables such as cabbage, broccoli, cabbage, radish, especially for cabbage and broccoli. The 1st to 2nd instar larvae eat the mesophyll on the back of the leaf, leaving a thin and transparent epidermis. The farmer is called the "skylight." The food intake of larvae above 3 years old increased significantly, and the leaves were eaten as holes or nicks. In severe cases, the leaves were eaten, leaving only veins and petioles, which affected plant growth and development. If the larva is scorched, the insects feed on the leaf ball, and at the same time, the feces are also excreted to contaminate the cabbage, resulting in a decrease in the commercial value of the vegetable.
Second, the incidence of bean worm
Generations. For more than a generation of pests, the algebra that occurs every year from north to south is gradually increasing. For example, Heilongjiang occurs 3 to 4 generations a year, Liaoning and Beijing 4 to 5 generations, and Jiangsu, Zhejiang, and Hubei occur 7 to 8 generations a year.
Wintering. The winter is over, and the second year is feathered.
Third, the method of prevention and control of bean worm
Agricultural control
It is timely to remove the old leaves of the residual branches and deepen the soil. This is an effective measure to reduce the density of the insects and reduce the source of the next generation.
Avoid cruciferous vegetable flakes as much as possible. The use of early-maturing varieties, plus mulching, early spring cabbage, broccoli planting period, early harvest, can avoid the second generation of larvae.
Chemical Control - Chemical Reference
2.5% cyhalothrin emulsion (medium toxic) using 40-50 ml/mu spray
5% Kavi & High Chloride Fluoride Water Emulsion (Medium Toxic) Use 8-12 g/mu spray
3% Avi· acetamiprid microemulsion (low toxicity) using 40-50 g/mu spray
4% Avi·Fluorine urea microemulsion (low toxicity) using 9-17 ml/mu spray
3.2% Aviline salt · Cyanide microemulsion (medium poison) Use 40-60 ml / mu spray
6% Avi-chlorobenzoyl suspension (low toxicity) using 40-50 ml / mu spray
50% insecticidal butyl ether urea suspending agent (low toxicity) using 15-35 g / ag spray
1 billion PIB/ml Spodoptera litura nuclear polyhedrosis virus suspension (low toxicity) using 50-75 ml/mu spray
10% ethathrin suspension (microtoxic) using 80-100 g/mu spray
10 billion spores/ml of short-lived bacillus suspension (low toxicity) using 800-1000 times spray
43.5% dibutyl ether urea suspending agent (low toxicity) using 57-80 ml / mu spray
25 g / liter of doxorubicin suspension (low toxicity) using 33-66 ml / mu spray
13% more killing insecticide nitrile suspension (low toxicity) using 24-29 ml / mu spray
14% worms and carbendazim suspension (medium toxic) using 10-20 g/mu spray
30% Avi-killing urea suspension (low toxicity) using 0-50 ml / mu spray
12% Avi · chlorfenapyr suspension (low toxicity) using 40-45 ml / mu spray
25% Avi·Ultraurea Suspension (low toxicity) Use 10-15 ml/mu spray
240 g / liter of methoxyfenozide suspension (low toxicity) using 10-20 ml / mu spray
22% cyanofluorfen suspension (low toxicity) using 60-80 ml / mu spray
40% chlorfluazuron suspending agent (low toxicity) using 14.4-18 ml / mu spray
0.5% matrine water (low toxicity) using 60-90 ml / mu spray
30% chlorpyrifos microcapsule suspension (low toxicity) using 65-95 ml / mu spray
5% chlorantraniliprole suspending agent (microtoxic) using 45-54 ml / mu spray
10% Avi·Indoxacarb Suspension (low toxicity) Use 8-12 ml/mu spray
3 billion PIB/ml beet armyworm nuclear polyhedrosis virus suspension (low toxicity) using 20-30 ml/mu spray
8000 IU / microliter of suspension of Bacillus thuringiensis (low toxicity) using 100-150 ml / mu spray
150 g / liter of indoxacarb suspension (low toxicity) using 10-18 ml / mu spray
60 g / liter of ethyl spinosad suspension (low toxicity) using 20-40 ml / mu spray
2% emamectin benzoate microemulsion (low toxicity) using 5-7 ml / mu spray
40 billion spores / Beauveria bassiana wettable powder (low toxicity) using 25-30 g / mu spray
Soybean is one of the main crops in China, and it is the best choice for both individual planting and large-scale planting. Therefore, you should remember to collect the above methods for controlling the insects and insect pests.
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