Kill, what pesticides are better to use to prevent heartworms on citrus, and which months are ideal

Kangkuan can try it, although the resistance is strong now, but it is safe.

Tree borers are a common pest that burrows holes inside tree trunks and destroys the structure of trees, causing them to grow slowly, die, or even collapse. In order to effectively control the tree borer, we can make the trap detection with pesticides. However, different pesticides have different control effects on tree borers.

At present, the commonly used pesticides on the market include organophosphorus, insecticides, pyrethroids, etc. Among them, pyrethroid pesticides are the most effective. The main ingredient of this type of pesticide is pyrethroid, which can kill most of the tree borer in a short period of time, and at the same time, it will cause too much pollution to the environment.

The use of pyrethroid pesticides for the control of tree borer needs to pay attention to the following points:

1.Select the appropriate pesticide brand and specifications, and use it according to the instructions on the sedan book;

2.Before using pesticides, the surface of the tree should be cleaned and the sawdust at the wormhole should be removed;

3.After diluting the pesticide, use a sprayer or brush to evenly apply the pesticide to the wormhole and the surface of the bark;

4.During the use of pesticides, it is necessary to pay attention to safety and avoid direct contact with pesticides or inhalation of pesticide odors.

In conclusion, pyrethroid pesticides are currently the most effective pesticides for tree borers, but they also need to pay attention to safety and correct use methods during use. Through scientific and reasonable prevention and control measures, we can better protect trees and make our environment better.

In the process of growth and development of citrus main pests and diseases and control of citrus, due to the influence of pests or adverse environmental conditions exceeding its adaptability, its normal growth and development is inhibited, and its metabolism is changed, resulting in reduced yield, poor quality, and even death, which brings great losses to the economic value of citrus and seriously affects the economic income of growers.

Common types of citrus pests and diseases are:

1. Scale insects and scale insects: they are harmful to the branches, leaves and fruits of citrus. Adults and nymphs suck the sap of tissues, and the damaged tissues cannot fully develop, and the tree weakens, causing leaf and fruit drop, affecting fruit quality, and inducing soot disease.

In Nanfeng orange area, there are mainly blowing cotton scales, black spot scales, and chaff scales.

2. Citrus anthracnose: citrus anthracnose often causes a large number of citrus trees to lose leaves, dead shoots and fruits, resulting in the weakening of the tree, the decline of products and quality, and even the death of branches and plants.

3. Red spider: mainly harms citrus leaves, branches and fruits. When the damaged leaves and fruits are severe, they turn gray and white, lose their luster, until they turn yellow and fall off. The peak seasons are from April to June and September to November.

The main pest control techniques of citrus are as follows:

Appropriate period and indicators of control Early spring (late February to mid-March) 1 2 leaves, late March to the end of March before flowering 3 4 leaves. After flowering, 6 leaves from September 5 to September (generally incurable in July and August), 10 to November 2 leaves.

Spring garden clearing Before the spring shoots sprout, you can choose to spray the whole garden once with Baumé stone sulfur mixture, pine alkali mixture 8 10 times liquid, 95% engine oil emulsion 80 100 times liquid or 99% green ying 150 200 times.

Before germination to flowering, you can choose 2000 times of 40% Zhanhong EC, 5000 times of emamectin, 1500 times of 20% mittetrazine EC, 1500 times of 15% pyridadinone EC, etc.

In other seasons, in addition to the optional pesticides before germination to flowering, you can also choose 73% sharp mite net emulsifiable concentrate 2000-300 times, insect mite nemesis emulsifiable concentrate 4000 times, 50% gram mite emulsifiable concentrate 2000 3000 times liquid (not suitable for use in the young fruit stage more than 30, navel orange fruit is easy to produce spots) and so on.

Protection of natural enemies Rational use of medicines, the implementation of health care cultivation, protection and utilization of natural enemies such as mite-eating ladybugs, predatory mites, mite-eating thrips, lacewings, insects, algae, sprouts and viruses.

Citrus diseases and insect pests mainly include citrus red spider, citrus whitefly, leaf miner, canker, resin, anthracnose, etc. It is necessary to selectively use high-efficiency, low-toxicity and low-residue pesticides for the prevention and control of pests and diseases that meet the control indicators within the forecast control period, and prohibit the application of high-toxicity and high-residue pesticides.

1. Citrus leaf mites.

Focus on February and August to reduce the base of insect sources, March to June and September to November for the peak period, more than 5 orange orchards per leaf, should be sprayed in time for control. Control agents can be used avermectin, mineral oil, spirodifen, liuyangmycin, thiobenone, pyridafen, etc.

2. Citrus leafminer.

Young trees and first-hanging fruit trees are sprayed in the summer and autumn shoots, and adult trees are controlled in the autumn shoots, and pesticides are applied when the shoots are long, and sprayed again every 7-10 days. The agent can be imidacloprid, acetamiprid, etc.

3. Citrus whitefly.

At the new shoot stage, the peak adult stage and 10-15 days after the peak period, thiazinone plus acetamiprid or imidacloprid is used for control.

4. Scale insects.

From late April to early May, the central insect strain was selected and treated; When most orange trees have more than 5% of the leaves of live larvae, the whole garden is treated. Agents can be thiazinone and chlorpyrifos.

5. Rusty ticks.

From June to July, if mites can be seen on 10% of the fruit surface or sporadic rusty peel fruit begins to appear, it should be treated with timely medication. The agent can choose mancozeb and liuyangmycin.

6. Ulcer disease.

The focus is on the prevention and control of young shoots and young fruits. Spring shoots in the leaf turning green period, summer shoots in the shoot length of 5-7cm, young fruit in diameter when the drug control, every 10 days spray the second spray. The agent can be used with thiamium copper, Bordeaux liquid (used in the garden and spring shoot stage), Zhongshengmycin, etc.

7. Anthrax and resin disease.

When the diseased leaf rate reaches 5% or acute lesions appear, timely medication should be used for prevention and control, and the prevention and control agents can be thiophanate-methyl, difenoconazole, mancozeb, prochloraz, etc.