It takes about how long it takes for the larvae of the American white moth to grow into a white moth

Adults of the American white moth like nocturnal activity and copulation, and lay eggs on the back of the leaf after mating, and the egg period is about 15 days. After hatching for a few hours, the larvae will spin the silk net, and begin to spin 1-3 leaves, as the larvae grow, the amount of food increases, and more new leaves are wrapped into the net curtain, and the net curtain also increases, and finally like a layer of white yarn to wrap the entire canopy. The larvae have a total of 7 instars, and after the 5th instar, they enter the gluttony period, and after eating up the leaves, they will transfer the damage.

Older larvae can tolerate starvation for up to 15 days.

The first generation of American white moth larvae generally hatches from mid-May to late June, and the second generation hatches from late July to mid-August, and the hatching begins to be harmful, seven to ten days of one instar, and the seventh instar needs a total of about three months, and the five instars enter the gluttony period, and the harm is serious, and then pupate, and emerge into adults in May of the following year after wintering, and continue to lay eggs.

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i look on the internet , there is a possibility of becoming a moth on september 25 !

7 years old. The American white moth is a white moth of the family of lamp moths, and the white moth is a white moth with a female body length of 9-15 mm and a wingspan of 30-42 mm; Male moths are 9-13 mm long and have a wingspan of 25-36 mm. Oval spherical, about millimeters in diameter.

The first hatchling larvae are generally yellow or light brown in color. The male pupa is thin and small, with a longitudinal ridge on the back, and the female pupa is more hypertrophied. There are 10-15 irregularly arranged gluteal spines at the end of the abdomen, and the ends of the gluteal spines are swollen and flare-shaped.

The adult American white moth has three characteristics: "phototaxis", "taste" and "food", and is more sensitive to odor, especially fishy, fragrant and odorous. Generally, in the surrounding trees such as toilets, livestock houses, and stinky puddles with poor sanitary conditions, epidemics are very likely to occur. The American white moth is native to North America, mainly in the United States and southern Canada, and its ecological distribution range is between 19°-55N°.

The first hatchling larvae are generally yellow or light brown in color. The head of the mature larvae is black, shiny, the head is mm wide, the body length is 22-37 mm, the head width is greater than the head height. Elongated, cylindrical, with a wide black longitudinal band on the back, each somite hair nodule is well developed, the hair nodules are white or grayish-white with black and brown long bristle bushes, the dorsal hair nodules are black, and the lateral hair nodules are mostly orange; valves white, oblong-oval, black-brown edges; ventral surface yellowish-brown or light grey; Thorax and feet black, hipped well-developed, gastropod lateral black, base and end yellowish-brown, ventral toe hook single, shaped middle band, middle toe hook 10-14, equal length, 10-12 on each side.

The larvae are generally 6-7 instars, the first and second generation larvae are mainly 6th instars, the 3rd generation is mainly 7th instars, if the food is insufficient, the larvae after 5th instar can pupate in advance. The developmental period is 32-40 days for the first generation, 24-30 days for the second generation, and 42-52 days for the third generation.

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The larvae are not stinging and are not poisonous, and are divided into three generations, with the first generation of larvae appearing from early May to mid-June, the second generation of larvae from early July to early August, and the third generation of larvae from mid-August to late September. The larvae are extremely resistant to hunger, and mature larvae will not die even if they do not feed for 15 days.

Morphological characteristics. The adult body length of the American white moth is about 14 mm, and the wingspan is about 35 mm. The body is pure white, most male moths have a few black or brown spots scattered on their front teeth, and female moths have no spots. The appearance of adults is easy to be confused with the star white light moth and willow poison moth.

The body length of the mature young moth is 32 mm. Head black (partly red), body yellow-green or grayish-black, dorsal midline yellowish-white. The dorsal hair of the body is black, and the hair nodules rise white and elongated hairs.

The American white moth can survive in temperatures as high as 40 and as low as minus 16; Older larvae can develop normally without feeding for 15 days and have a strong hunger tolerance.

Chemical control: Cypermethrin emulsifiable concentrate is used to dilute and spray to kill the larvae of the American white moth. Biological control:

Taking advantage of the mutual restraint relationship between species, Zhou's rodent wasps were placed to inhibit larvae. Physical control: cut off the net curtain left by the larvae of the American white moth and burn it for destruction.

Manual killing: Place props such as insecticidal lamps to trap and kill.

1. Chemical control

American white moth larvae can be eliminated by chemical control methods, diluted with cypermethrin emulsifiable concentrate and dichlorvos emulsifiable concentrate, and then used manual spraying or trunk painting to kill, or you can use a sprayer, about meters away from the trunk, ring spray, also has a very good control effect.

2. Biological control

Biological control is mainly the use of mutual restraint between species to eliminate the larvae of the American white moth, which can be placed in the vicinity in a cluster before the larval pupates, with the Zhou's rodent wasp as the main parasitic wasp, which can effectively control the population of the American white moth larvae, set up traps, and kill the adults to reduce the reproduction rate.

3. Physical prevention and control

When the larvae of the American white moth spin silk and form a net, it will leave a clear net curtain on the leaves or the edge of the tree, and when the net curtain is found, it will be manually cut off and burned to destroy, and pesticides will be sprayed around, and the position of the tree trunk is a circle of grass to attract larvae to concentrate the pupation, and the larvae after concentration are destroyed.

4. Artificial hunting

Using the phototaxis of the larvae of the American white moth, trees and open areas, place trapping lights, insecticidal lights, black lights and other props to trap and kill the larvae, and pay attention to the place where the lights are hung to avoid tall obstacles.

The American great white moth is a white moth with a female body length of 9-15 mm and a wingspan of 30-42 mm; Male moths are 9-13 mm long and have a wingspan of 25-36 mm. The ventral surface of the antennae of the male moth is black-brown, bidentate-like, black, 5 mm long, the inner ctenophores are shorter, about 2 3 of the outer tentenes, the lower lip is small, the outer side is black, the inner side is white, and the mouthparts are short and slender. The back of the thorax is densely covered with white hair, most of the abdomen is white and spotless, and a few individuals have a yellow abdomen with black spots.

The American great white moth is a white moth with a female body length of 9-15 mm and a wingspan of 30-42 mm; Male moths are 9-13 mm long and have a wingspan of 25-36 mm. The ventral surface of the antennae of the male moth is black-brown, bidentate-like, black, 5 mm long, the inner ctenophores are shorter, about 2 3 of the outer tentenes, the lower lip is small, the outer side is black, the inner side is white, and the mouthparts are short and slender. The back of the thorax is densely covered with white hair, most of the abdomen is white and spotless, and a few individuals have a yellow abdomen with black spots.