In recent years, more and more apple growers reflect that the orchard apple leaf curl moth occurs seriously, apple leaf curl moth is a common insect pest in apple planting, its reproduction is fast, the damage time is long, affecting the yield and quality of apples, if the prevention and control is not timely, it will cause 50-80% of the apple to lose its commodity value, causing great economic losses to growers, so fruit farmers must pay attention to insect pests to increase prevention and control. So what are the symptoms of apple leaf curl moth harm? What is the law of harm? How can it be prevented? Today I will tell you about it.
<h1>First, first know the apple leaf curl moth</h1>
The apple leafroller moth (licking worm) belongs to the order Lepidoptera, the family Cyperidae.
The larvae are 13–18 mm long and slender emerald green.
Adults are 6–8 mm long, have a wingspan of 15–20 mm, are yellowish brown, and have two brown tlanches on the forewings. The eggs are flattened and oval, 0.7 mm in diameter, pale yellow and translucent, black and brown before hatching, and dozens of eggs are arranged into fish scales, mostly on the leaf surface and fruit surface.
Eggs: Flattened, round, milky yellow, multiple eggs — often 30-70 in a fish-scale arrangement.
Pupa: Yellow-brown, about 10 mm long. The body is curved in an S-shape, and the 3rd to 7th segments of the abdomen dorsally mask two rows of spines, the front row is large and thin, and the back row is small and dense. The ventral end has 8 short, thick hip spines.
<h1>Second, apple leaf curl moth hazard symptoms:</h1>
The apple leafroller moth mainly harms the leaves and fruits of apple trees with larvae.
Apple leaf curl moth in the larval stage, due to small age, mainly to apple buds, buds or young leaves for food, some apple buds will produce the phenomenon of death, is not conducive to apple flowering and fruit setting, after the branch spit silk leaves into the "insect bag."
After the apple leaf curl moth larvae grow to 3 years old, they will dive in the leaves by spitting silk, and eat new leaves, and the phenomenon of leaf curling will occur, affecting the healthy growth of apples.
After the expansion period of apple fruit setting, the apple leaf curl moth will cause the formation of a concatenation between the leaves and the fruit, and the apple leaf curl moth will begin to nibble on the apple peel and flesh, resulting in the formation of residual fruit in the apple, which is conducive to the occurrence of disease.
The biggest harm of the apple leaf curl moth is fruit turning, and one larvae can cause harm to at least 6 apples, and serious can reach 8 apples.
Therefore, the apple leaf curl moth is a very harmful pest in apple planting and production, which seriously affects the quality and yield of apples, and fruit farmers should pay special attention to it!
<h1>Second, the harm law of apple leaf curl moth:</h1>
The apple leaf curl moth overwinters in thin white cocoons of larvae in old bark crevices, old warped skins, and dead skins around the saw openings;
In the second year, the apple tree begins to sprout, the overwintering larvae begin to sting, and the apple blooming period is the peak period of the larvae, which lasts for one month before and after;
After 3 years, the larvae have a habit of metastasis, mainly harming the leaves and apple fruits, making the fruit surface appear irregular flaky pits, and eventually forming dry scars;
After the larva matures, the new leaf rolls to internalize the pupa, the pupal stage is 6-9 days, the moth stage is 3-5 days, the pupae feathering adult can lay eggs in 1-2 days, and the single female moth can lay more than 100 eggs, the egg period is 6-8 days, and the larval stage is 15-20 days.
It is the feathering period from early May to early June, with the first generation of larvae in late May, the second generation of larvae in early July, and the third generation of larvae in early August.
The first generation of larvae mainly harms the leaves and sometimes the young fruits; the second and third generations of larvae harm both the leaves and the young fruits.
After feathering, eggs are laid on the second or third day, and the leaf surface is the main location for spawning, with an egg stage of 6 to 10 days.
It usually begins to overwinter in October in larval form. Heavier rainy years occur heavily and dry years occur lightly.
Apple leaf curl moth occurs three generations per year, and the generations overlap, the resistance is extremely strong, and the spitting leaves into "insect bags" have added difficulties to the control.
<h1>Third, the agricultural control method of apple leaf curl moth</h1>
1. Remove weeds and leaves in the garden in winter; before the apple tree germinates, scrape the coarse skin and warped skin on the trunk, the saw opening and other parts, remove some overwintering larvae, and reduce the insect population base.
2. When the orchard finds the "insect packet", it is recommended to manually remove the "insect packet" or cut off the "worm packet" in time for centralized destruction.
3. The red-eyed bee is the natural enemy of the apple roll moth, releasing the red-eyed bee 3 to 4 days after the peak of overwintering adult egg laying, releasing the bee once in 5 days, and releasing it 4 times in a row, which can achieve no harm throughout the year.
4. Using adult insect tendencies, prepare sweet and sour liquid, the liquid according to brown sugar and sprinkle 1 part, vinegar 3 parts, water 16 parts, add a small amount of cypermethrin, from June in the can bottle or small pot, hanging in the canopy, 1 to 2 per acre can be hung, lure apple leaf curl moth adult insects for elimination.
5. Hang more than two lure lights such as solar insecticidal lamps and black lights per acre, and use the phototropism of the leaf curl moth to lure and kill.
6. The use of green prevention and control products such as armyworm board, sex core, real fly sticky board, adhesive, sticky shellac can effectively control the number of insect mouths of pests, and can also avoid the use of pesticides with great possibility.
<h1>Fourth, the chemical control method of apple leaf curl moth</h1>
According to the harm law of apple leaf curl moth, it is recommended to control it in the following three key stages:
1. Prevention and control before the budding of fruit trees: spray chlorpyrifos, high-efficiency cypermethrin and other agents to kill overwintering larvae.
2. 60% of the overwintering larvae begin to spray control: (It is not recommended to miss the time when the apple is in full bloom)
Drug selection: 35% chlorhexabenzamide water dispersible granules 15000 times liquid, or 5% urea 1500 ~ 2000 times liquid, or 10% pyriproyl ether + 20% insect mite nitrile, or 3% methyl vitamin salt, etc., alternate medication, spray twice before apple bagging, the interval between the two doses is 7-10 days. It is effective in killing leaf curl moths, and has a good killing effect on larvae, adults and eggs.
3. Spray control during the incubation period of the first and second generations of larvae: the time is late May and early July.
Control agent selection: high-efficiency cypermethrin + insecticide, carbonitrile + pyridophet, avermectin + chlorantran benzamide, matrine, kung fu + methylphenidate and other agents are used alternately, and the drug is used twice continuously, with an interval of 7-10 days.
Precautions: If the apple orchard leaf curl moth is more serious, focus on the emergence of overwintering larvae and the incubation period of the first generation of larvae for control. Uniform spraying agent is the key to improving the effect of pest control, orchard managers must fully cover every corner of the orchard, scientific spraying of the agent, and in this process, auxiliary silicones can be added to enhance the penetration and coverage area of the agent.
Conclusion: The control of apple leaf curl moth must be used in a critical period, and at the same time, combined with agricultural control, the source of insects will be minimized to lay a good foundation for the apple harvest in 2019.
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