Apple leaf curl moth is also known as cotton brown ribbon roll moth, apple leaf curl moth, tea leaf curl moth, yellow small leaf curl moth, commonly known as licking skin worm, slippery skin worm. It belongs to lepidoptera, cynodontidae. It can harm cherries, apples, peaches, plums, apricots, begonias, citrus, tea trees, etc., and also harm cotton. It is mainly harmful to cherry blossoms, leaves and fruits.
1. Morphological characteristics of apple leaf curl moth
1. Adult insects. The body length is 6 to 8 mm, the wingspan is 13 to 20 mm, and the body is yellowish brown. The leading edge of the forewing has two thick brown twill stripes on the posterior margin and the outer margin angle, one of which is significantly widened when the leading margin reaches the central part of the wing from the leading margin to the posterior margin. There is a small brown stripe at the shoulder angle of the hind margin of the forewing and at the near apex of the leading edge.
2. Eggs. Flat oval, pale yellow, translucent, dozens of grains arranged into fish-scaled eggs.
3. The larvae have slender bodies and smaller heads that are pale yellow. The small larvae are yellow-green and the large larvae are emerald green. The pupa is yellowish brown with two rows of spines on the back of the abdomen, a small and dense row below, and 8 hook-like spiny hairs at the tail end.
Second, apple leaf curl moth as a pest symptom
The larvae moth into the newly germinated shoots in early spring, and the heavily affected buds die and the light ones are incomplete, affecting leaf spread and flowering. The larvae at the bud stage are transferred to the flowers as a pest, and most of the affected flowers cannot set fruit, and even the fruit set is stunted. After the leaf spread, the larval leaves are interspersed with leaf adult buds, sneaking into it to eat the flesh of the leaves, and when the buds are finished eating, they turn to the new shoots and young leaves, and re-roll the leaves to form buds. After the fruit appears, the leaves are often attached to the fruit, and the peel and flesh are eaten, and the surface of the fruit is damaged like a small pit. The larvae have the habit of turning fruit into pests, and one larva can turn fruit into 6 to 8 harmful peach fruits.
Third, the occurrence of apple leaf curl moth
Occurs 2 to 3 generations a year. It overwinters with small larvae in gaps such as upturned skin slits and sawholes. When the buds bloom, the larvae begin to sting, and the larvae are harmful to the buds, young leaves and buds. The leaf extension suffixes the leaves and damages the leaves and pupates at the overlap of the two leaves or in the curly leaves. The eggs are laid on the back of the leaves. The egg stage is 6 to 7 days. The hatching larvae are several to ten heads nibbling on the leaf flesh near the midrib of the leaf dorsal. After reaching 3 instars , some of the larvae crawl between the two fruits , the junction of the leaves , or the stalks to nibble on the flesh and skin. In mid- and late September, the larvae overwinter in cocoons. Adults have phototropism and chemotaxis, and have strong tendencies to juice, sweet and sour solutions and lees water. The larvae are touched and immediately spit and sag.
Fourth, the control method of apple leaf curl moth
1. Biological control. Artificial release of pine caterpillar red-eyed wasps: use sweet and sour, fruit vinegar, or apple leaf curl moth pheromone traps to monitor the extinction of adult occurrences. Since the date of the emergence of overwintering adult insects in the trap, the fourth day began to release the red-eyed bee control, generally every 6 days to release the bees, 4 to 5 times in a row, about 1.5 million bees per hectare, the egg parasitism rate can reach about 85%, basically control its pest. Control of apple leaf curl moth with biological agents: In the early stage of a generation of larvae, Bt emulsion No. 2001 and Suurea No. 1 1000 times liquid were used for control. Use the chemotaxis of adults to induce adults. Use wine: vinegar: water (5:20:80) or fermented tofu water, etc.
2. Manual removal of insect buds. Before germination, completely scrape off the upturned bark on the tree (including various explosive skins caused by pests such as latent moths), burn the scraped skin in time, eliminate the overwintering larvae, and manually remove the buds until the emergence of overwintering adults.
3, the use of adult insects of the phototropism. The use of phototrophotistic devices black light lamps to trap adult insects can be used as a means of detecting the growth of adult insects during their occurrence.
4. Chemical control. Before germination, a pyrethroid insecticide 1000 times solution is applied to the shear, saw and warp to kill the overwintering larvae in the cocoon. Spray 5% methylaminoavermectin benzoate emulsion 4000 to 5000 times liquid, or 25% urea suspension No. 3 1000 to 1500 times liquid, or 20% urea wettable powder 1500 to 2000 times liquid. The spraying time should be mastered in the first generation of egg incubation and the young larval stage.