Rice has rice leaf roller, how to prevent and control it?

Pesticides. Because pesticides can kill leaf rollers, and the effect is very good, so pesticides can be used to control well.

Rice has rice leaf roller, to prevent the leaf roller borer from appearing on rice, you need to regularly spray some pesticides on rice, spray on the surface on it, pesticides are a good pest.

The peak hatching period of the first instar larvae to the second instar larval stage is the best period for prevention, and the current control agents are recommended for emamectin benzoate, chlorantraniliprole, tetrachlorantraniliprole, methoxyfenozide, indoxacarb, chlorfenapyr, lice urea, etc., and it is recommended to compound the mainstay, emamectin benzoate + chlorantraniliprole, emamectin benzoate + indoxacarb have good effects.

Although it is difficult to control rice leaf borer, the dosage of this increase is more per mu and the cost is high, which is in line with the plant protection policy?

From early to mid-July to mid-August, it is the control time of rice leaf roller. In early to mid-July, the rice leaf roller borer migrated for the first time, and the peak of adults appeared in late July, and severe leaf curling appeared in mid-August. If you use drugs for prevention and control, it is advisable to spray the leaves after rain without water droplets or after the dew dries in the morning, the more liquid medicine attached to the rice leaves, the better the control effect, and the spray should be uniform and comprehensive.

Attention should be paid to avoid partial application of nitrogen fertilizer to aggravate the harm of rice leaf roller.

1. The control time of rice longitudinal leaf roller.

1. The control time of rice leaf roller borer is from early to mid-July to mid-August. The first migration is in early to mid-July, and there is a peak of adults in late July. In early and mid-August, they moved in again, and leaf curling appeared in the fields, and severe leaf curling appeared in mid-August.

2. Rice leaf roller borer is a leaf-eating pest, the more liquid medicine attached to the rice leaves, the better the control effect, especially the application of contact killing agents, spraying should be uniform and comprehensive.

3. It is advisable to spray the leaves without water droplets after the rain or after the dew dries in the morning, and it is not suitable to spray in rainy weather, so as not to roll off the liquid and reduce the efficacy.

4. Reasonable fertilization, avoid partial application of nitrogen fertilizer to make rice leaves tender and green, vigorous growth, late maturity in the later stage, aggravate the harm of rice leaf roller, it is advisable to increase potassium fertilizer, and foliar spraying of potassium dihydrogen phosphate.

2. Harmful symptoms and prevention methods of rice leaf roller.

1. Harmful symptoms.

The larvae of rice leaf roller borer spin silk leaves longitudinally rolled into a tube to absorb the void, lick and eat the mesophyll, and the damaged leaves are not accompanied by only a layer of skin. The severely damaged fields have turned white and cannot even be extracted, resulting in a reduction in rice yield.

2. Prevention and control methods.

1) The prevention and control of rice leaf roller borer generally adopts a combination of agricultural control, biological control, and pesticide control.

2) Agricultural control includes the selection of insect-resistant varieties and the strengthening of fertilizer and water management to prevent rice from growing violently in the early stage and greedy for green and late maturing in the later stage.

3) Biological control mainly uses the natural enemies of rice leaf roller borer in nature, such as red-eyed wasps, cocoon wasps, frogs, etc., to control the insect pest populations in the field by stocking red-eyed bees. When the larvae are full of dead eggplant, bacillus borer or Bacillus thuringiensis can be sprayed for control.

4) 50% phosphine EC, 50% pine mothion EC, 25% Ecumers (silicofon) EC, 90% trichlorfon, 42% Trik EC, etc., can be sprayed after mixing with water.

10% emamectindocarb suspension 20 ml + 48% chlorpyrifos EC 50 ml + essential oil 15 ml. 2-3 buckets of water per mu, each bucket of water uses: 50 ml of 5% avermectin EC + 80 ml of 25% probromixin thion EC + 15 ml of essential oil.

It is not easy to plant rice, and the weeds have not been beaten yet, and the borer and leaf roller borer are coming again.

In the early stage, Guangxi, Guangdong leaf roller borer occurred heavily, and recently Jiangxi, Hunan, Hubei and other places also found that some fields have more leaf rollers, and there are 3-4 instars in the first-season rice fields of broken heading, and there are many leaf rollers.

In recent years, the leaf roller borer has also shown resistance, mostly ** leaf roller borer (Striated rice longitudinal leaf roller borer), its older larvae have yellowish body color, greater appetite, heavier harm, and stronger resistance.

If there are more white leaves or leaf bracts in the field, they should be treated with medicine in time, and serious fields should be sprayed again at an interval of 10-15 days.

In order to avoid serious yield decline, especially at the jointing and heading stage of rice, the whitening of functional leaves will affect photosynthesis and lead to incomplete grain filling and premature senescence.

From the perspective of control, rice leaf roller borer is not easy to control. Because when the insect reaches its second instar, it wraps itself in the leaves. In this way, many contact pesticides cannot hit the insects at all, which leads to the control effect will not be very good.

So there are a couple of caveats for this:

The spraying time is very critical, it is best to spray when the eggs are at their peak and the second instar has not yet rolled into the leaves, so that the result is twice as effective with half the effort.

For prevention and control after leaf rolling, gastric toxicity and fumigation pesticides must be used as the leading drugs, and contact killing and systemic pesticides must be used as auxiliaries.

Synergists such as silicones, essential oils, and barrel mixing additives are added during prevention and control to improve the scalability, permeability and rainwater erosion resistance.

How to control rice leaf roller.

1. In the first prevention and control of resale 7-15 days after transplanting, it is recommended to have 1-2 buckets of water per mu. At this time, the seedlings are relatively small, and the water consumption for control can be less.

However, in the peak tillering period, breaking stage, and heading stage, at least 2 buckets of water are needed for each mu of land, and it is best to get 3 buckets of water. Because the amount of water is large enough, the contact between the liquid medicine and the rice leaves will be more uniform and complete, and the control effect will be better.

Choose one of the three.

2-3 buckets of water per mu, each bucket of water uses: 10% emamectindocarb suspension 20 ml + 48% chlorpyrifos EC 50 ml + essential oil 15 ml.

2-3 buckets of water per mu, each bucket of water uses: 50 ml of 5% avermectin EC + 80 ml of 25% probromixin thion EC + 15 ml of essential oil.

2-3 buckets of water per mu, each bucket of water uses: emamectin flubellamide emulsifiable concentrate 80 ml + 36% cyanofiprohydrazine indocarb 10 grams + essential oil 15 ml.

Summary

The pesticides suitable for the control of leaf roller borer are: chlorantraniliprole (Kangkuan), emamectin benzoate (emamectin), avermectin, indoxacarb, chlorfenapyr, lice urea, ethylspinosamad, emamectin, indocarb, emamectonil, chlorfenapyr, indoxacarb, etc. There are many agents to choose from, and it is recommended to rotate the drugs reasonably to reduce the occurrence of resistance.

Rice leaf curling generally occurs in the warm climate, abundant rainfall, and the growth of grass seedlings is tender and green. The prevention and control measures are as follows.

1. It can be considered to use rice resistance, select high-yield varieties resistant to diseases and insects, and combine reasonable fertilization to prevent rice from growing tender and green in the early stage.

Rice leaf curling generally occurs in the warm climate, abundant rainfall, and the growth of grass seedlings is tender and green. The control measures are as follows: 1. It can be considered to use rice resistance, select high-yield varieties resistant to diseases and insects, and combine reasonable fertilization to prevent rice from turning tender and green in the early stage. 2. When there is a peak larval period, you can consider using 25% insecticidal double aqueous spray.