Growing kiwifruit farmers know that in the production and management of kiwifruit, there are still many diseases and insect pests, and if you want to make kiwifruit harvest, you must carry out careful management and do the pest prevention work in place, in order to effectively ensure the normal growth and development of kiwifruit.
According to the survey, in the pest of kiwifruit, apple leaf curl moth is a kind of pest with greater harm, mainly to harm the young fruit of kiwifruit, but also to endanger the buds, young shoots and other tree parts, if not paid attention to prevention and control, its impact is very serious.
Apple leaf curl moth adult
Apple leaf curl moth is also known as the small yellow leaf curl moth, larvae commonly known as "licking skin worm", belongs to the lepidoptera, leaf curl moth family pests, it will not only endanger kiwifruit, but also to apples, peach trees, pear trees, etc. caused certain harm, but are mainly harmful to young fruits. Therefore, in order to effectively control the harm caused by insect pests, save fruit trees to improve production, it is necessary to carry out research and prevention of insect pests, the following is a summary of some of the information and control methods of Apple Leaf Curl Moth summarized by Xiaoguo, hoping to be able to help fruit farmers.
<h1 class= "pgc-h-arrow-right" >, what are the harmful characteristics of apple leaf curl moth? </h1>
The apple leaf curl moth is the most common and serious pest of kiwi fruit. If not prevented in time, the fruit victimization rate can reach more than 80%, and the young fruits that are killed are deformed and ugly fruits when they grow up, which is difficult to sell and cause great harm to the production of kiwifruit.
Apple leaf curl moth harms the fruit of the kiwi fruit
Hazard mode: Apple leaf curl moth is mainly a larvae licking the skin on the young fruit. It mainly harms the fruit, followed by buds, young shoots and leaves. It can be seen that it not only harms many hosts, but also has many harmful parts, such as the consequences of not preventing and controlling are unimaginable.
<h1 class="pgc-h-arrow-right" >2. What is the life habit of the apple leaf curl moth? </h1>
In Cangxi, where the average annual temperature is 16.9 °C,
When the kiwi fruit begins to sprout in early to mid-March of the following year, the larvae stings the young shoots and leaves, and spits silk to connect the young leaves so that they cannot be stretched, but the harm is very light, and there is no obvious harm to the buds and leaves.
Pupates pupate in early to mid-April, adults begin to appear (the first generation) from late April to early May, and begin to lay eggs, the larvae hatch in mid-May, and about 20 days after flowering begin to harm the young fruit. In the later period (June to September), the occurrence of each generation is not obvious, and there is not much harm.
Adults emerge diurnally and nocturnally, with phototropism and chemotaxis. The eggs are mostly laid on the back of the leaves, and the single female lays 3 to 5 eggs, and dozens of eggs are arranged into fish scales.
The larvae are very active and have a harmful habit of turning leaves; in particular, the vibrating larvae twist violently, and the body comes out of the curly leaves or the fruit surface, and the spit is sagging. After the larvae mature, they need to turn the leaves and then pupate in the curly leaves. When the larvae harm the young fruit, they all harm between the fruit and the shade of the fruit and the leaf, and only the peel.
< h1 class= "pgc-h-arrow-right" > three effective control methods for the apple leaf curl moth</h1>
1. Agricultural control
Scrape the shell of the branches in winter, eliminate the overwintering larvae and pupae: in winter, the coarse skin and shell around the shearing saw and on the branches are completely scraped and concentrated, reducing the source base of the insects in the following year.
Artificial egg removal: In early and mid-April, the search for cleared egg patches on the back of the leaves begins.
Dive traps: Use the habit of overwintering the larvae in the cracks in the bark of the trunk, tie grass to the branches before wintering, and remove the grass and burn it before the larvae come out of the mat in the spring.
Fruit thinning: 10 days after flowering, thinning fruits and leaves, try to avoid fruit and fruit leaves, reduce larval harm sites;
Fruit bagging: before the larvae concentrate on the fruit hazard, use a single-layer yellow paper bag for bagging, and must be sprayed once before bagging 90% crystal enemy insects 800 to 1000 times, with spraying with bagging, but must be set after the fruit surface potion is dried.
2. Physical and chemical control
Booby traps are carried out in each generation of adults (starting in late April) using black light lamps and sex attractants. Or use sweet and sour solutions to trap adult insects. The preparation method of sweet and sour liquid is: 0.5 kg of brown sugar, 1 kg of vinegar, 1 liter of water, add a little white wine; or use 1 kg of fruit vinegar, 1 liter of water, add a little brown sugar. Place 3 to 4 pots per acre, pick out the dead insects every 1 to 2 days, and add sweet and sour liquid in time.
The use of extrasexual hormones to induce female and male adult insect activities, so that male adults can not find the source of extrageric hormones and are lost, so that the mating of male and female insects is disturbed, and then play a role in prevention and control. In late April, 2 to 4 exotropic hormones are placed in the field according to each mu, with a content of 500 micrograms of extrasexual hormone cores, which are valid for 30 days and have an effective trapping distance of about 150 meters.
3. Pharmaceutical prevention and control
The critical period for the control of apple leaf curl moth is when the overwintering larvae begin to move in early to mid-March and before the first generation of larvae are fruited, mainly by spraying the first generation of larvae that occur neatly.
At this stage, the commonly used agents are, 90% crystalline dimethoate 800 to 1000 times liquid, or 50% borer thiophos emulsion 1000 to 1500 times liquid, or 58% wind thunder emulsion 800 times liquid; after the expansion stage of fruit, spray plant-derived pesticide 2.5% rotenone emulsion 1000 times liquid spray, or microbial source pesticide Bacillus thuringiensis 10 billion spores / ml Bt emulsion 500 to 1000 times; spray once after winter pruning once 3 to 5 times bomeidu stone sulfur compound to kill some of the overwintering larvae.
< h1 class="pgc-h-arrow-right" > concluding remarks</h1>
Whether it is kiwi fruit or apple or peach, the young fruit stage is the most tender time, and it is also the time when it is the least able to withstand the damage of external hard wounds. Therefore, in line with the goal of producing high-quality fruits, the pest control of the young fruit stage, especially the pests like the apple leaf curl moth specially for the fruit, should be paid attention to, and once found, measures should be taken immediately to protect the young fruit from harm.