When is the best time to prevent rice borer?

breeding insect-resistant varieties, which of course is done by breeders;

2. Suppress the source of insects, timely spring ploughing and irrigation to soak the field, which can kill part of the rice; Straw and overwintering larvae in the soil. The land that cannot be flooded must be ploughed and cleaned and destroyed. In winter and spring, weeds and white plants at the edge of the field are eradicated, rice roots are picked up, and fertilizer is made.

For the straw used for firewood and the straw reserved for industrial use, the agent should be sprayed during the adult stage, once every 5 7 days, until the end of the feathering.

3. Agricultural measures to control borer: it is necessary to establish a reasonable farming system and the layout of aquatic varieties to avoid mixed planting and excessive growth period; Improve seed purity and strengthen water management, so that rice grows robustly and produces neat ears. Using the selectivity of adult oviposition, a booby-trap field is set up and eliminated intensively.

4. Pharmaceutical control: 50 parathion EC or 50 50 methamidophos EC, 45 Le'an phosphorus EC, 50 dimethoate EC, 100-150 ml per mu for the prevention and control of heart seedlings, 12150 ml per mu for the prevention and control of white ears, 25 kg of fine soil mixed into poisonous soil and spread, and 400 kg of water can also be poured into liquid medicine. Regardless of the method of medication, the paddy field should be kept in shallow water at 3 cm for 3 to 5 days.

5. Biological control: to protect and utilize natural enemies, you can use 1 2 grams of water to water 500-1000 kg of straw borer fungus, and pour rice piles.

Rice mountain flower is the best when there is no prevention. To prevent this three-picture. Alas, it is best for them to prevent in times of trouble, and to let them.

The medicine of the law cures. The keys they made were good, so. Take a good look at him!

Time Liu Fang is good, thank you.

Summary. The best time to administer is when the borer hatches and pupates, and the eggs can be observed, and if most of the eggs have blackened, they need to be sprayed. Mainly according to the rice seedlings and pests to decide, the best time to administer is when the borer hatches and pupates, you can observe the eggs, if most of the eggs have appeared blackened, you need to start spraying.

The best time to administer is when the borer hatches and pupates, and the eggs can be observed, and if most of the eggs have blackened, they need to be sprayed. The main focus is to decide according to the seedling condition of rice and the situation of pests, the best administration time is when the borer hatches and pupates, you can observe the eggs of the insects, if most of the eggs have appeared blackened, you need to start spraying.

It is reported that the control time of rice borer is generally July, and the control time of rice borer is generally during the breach period of rice borer (when the break is 5%-10%). Generally, the two borers will lay eggs into the mu of rice in May and June, and the larvae can hatch in about half a month, and absorb the juice in the rice stalks after hatching, so that they gradually slag and are resistant to yellowing and wilting.

The approximate control time of the three chemical borers began in mid-July.

Rice borer (

1. Under normal circumstances, the effect of prevention and control in the peak period of rice borer incubation will be better, and during the incubation period of the eggs, it is necessary to do early breaking and early medication, late breaking and late medication, when 5 to 10% of the eggs begin to break, the first reply can be carried out.

2. The time of the first application is usually 2 to 3 days before rice transplanting, and the seedlings can be concealed by watering the seedlings with 15 ml of 20% chlorantraniliprole mixed with water.

3. The time of the second application can be selected in the jointing stage of rice, and the stem and leaves can be sprayed with 10 ml of 20% chlorantraniliprole mixed with water per mu.

4. The time of the third application can be selected at the rice heading stage, and 5 ml of 20% chlorantraniliprole mixed with water is used for stem and leaf spraying per mu, which has a good control effect on lepidopteran pests that occur in the whole season of rice.

Rice borer control drugs

1. Before sowing or transplanting.

Use 3 kg of 3% carbofuran granules (or up to 2 kg of 3% carbofuran granules) to mix 15 to 20 kg of fine soil per mu, and then sprinkle on the water surface.

2. When planting seedlings.

400 to 500 kg of water were mixed with kilograms of 90% crystal trichlorfon per mu, and then the seedlings were soaked in the liquid for 10 minutes.

3. After transplanting.

1) 100 ml of 50% pine borer EC, or 100 ml of 50% Batain water solvent, or 100 ml of 50% methamidophos emulsion mixed with water 150 to 200 kg, and then poured in the field.

2) Use 150 ml of 40% dimethoate emulsifiable concentrate, or 100 ml of 50% dimethoate emulsifiable concentrate mixed with 200 to 300 kg of water, and then pour. Or halve the amount per mu, and then mix 50 kg of water for spray treatment.

3) 1 to 2 days before the ant borer enters the peak hatching period, mix 60 to 80 ml of 50% pyrimidine phosphorus emulsifiable concentrate with 75 to 100 kg of water per mu, and then spray.

4) Spray with 50% 50 to 100 grams of Yiweizhi soluble powder mixed with water, or spray with 75 to 100 ml of 50% instant pine emulsifiable concentrate mixed with water per mu.

5) Rice leaf roller borer can be controlled in the peak hatching period of insect eggs, when the degree of occurrence is light, spray with 50 ml of avermectin (or 45 ml of 2% avermectin) with 15 to 30 kg of water, and the water consumption can be appropriately increased according to the growth of rice and insect conditions, and then sprayed once every 15 days. If the occurrence is more severe, 75 to 100 ml of avermectin (or 70 to 100 ml of 2% avermectin) can be sprayed per mu, and it can be sprayed again once after 10 days.

Rice stem borer pests mainly include two borers and three borers. All belong to the lepidopteran moth family and need to be controlled before their stems are bored (after hatching to the larval stage before the second instar). It is quite tiring to comprehensively survey the development progress of larvae in the field, and it is recommended to use sex pheromone detection (when I was in the Institute of Zoology of the Chinese Academy of Sciences, I was engaged in the research on the application technology of sex pheromones of rice borer), or use black light to monitor and report, and wait 5-8 days after the peak period of moths, which is the normal time to fight.

The best time to control the borer is usually between July 5 and 20. It takes about half a month for the larvae to hatch and bury into the stalks, so this time is the best time for control.

The general effect time of the control agent is 5-7 days, the prevention and control is too early, the eggs are not hatched into larvae, and the agent cannot play a role; The control is too late, the larvae eat into the stalks, and the control effect is poor.

The two borers belong to two refractory pests, the medicine is early, the eggs are not hatched or the larvae have just hatched to feed, the range of activities is relatively small, and the two borers are difficult to clean. The drug is late, the seedlings have been injured and the older insects basically do not move and do not eat, it is inevitable that there will be insects that have slipped through the net to lay eggs, and rapidly increase the base of the next generation of worms, so it is necessary to use the drug in the peak period of egg hatching.

Now the labor cost is high, most of the medicine is a bucket of water to hit one to two acres of field, the most cost-saving is to keep the field water layer for three to five days after the use, according to the habit of the two borers can play a more effective role, water retention can increase the efficacy of at least 30%.

Tips. Dimorphic borer] mostly occurs at 1m away from the ridge of the paddy field, observe the position of the stem on the water surface about 10cm, the leaf sheath has irregular yellowing, and the heavy one is accompanied by brown stripes, at this time, the leaf sheath will be found in the larvae of the dimorphic borer, which is the best period for control.

The best control time of rice borer should be determined by the insect condition and seedling condition, the prevention and control of dry seedlings is mainly insect condition, that is, the peak period of egg mass hatching, the second day when 50% of the egg masses turn black at the bottom is the peak period of hatching, which is the best period for the prevention and control of dry seedlings; The prevention and control of white ears should be based on seedling conditions, that is, in the appropriate period of prevention and control, look at the growth period of rice, and reach the stage of breaking and heading, which is the best period for the prevention and control of white ears. Due to the different speed of action of various pesticides, biological pesticides should be applied appropriately in advance.

What is the best time for the control of the second chemical borer.

I think the two colors are matched to find a way to do it! You.

Prevention and control during the peak hatching period of young eggs... Weiwei agricultural materials, agricultural materials experts around you **.