Papaya

June 18, 2019

Alias: oriental oysters, morphological characteristics, shell, female shell, round or nearly circular, dark purple, the first time the shell is in the middle of the shell, dark brown, second brown shell. The male shell is oblong and dark purple, and the first shell is on one side. The female adult has a body length of 1 mm, a wide head and chest, and a horseshoe shape. The surrounding vaginal glands have 4 to 5 groups, with no hardened markings in front of the vulva. The length of the glandular duct on the back of the end region is less than half of the hipplate, and the glandular ducts in the subregions of the 2nd and 4th abdominal segments are narrow. Three pairs of hip leaves, the lateral commissure split only 1 flap.
Damaged crops such as papaya, orange, banana and coconut are damaged, and nymphs suck papaya trunks, fruits, stalks, lateral branches and tender buds. The victim's fruit is odorless, hard and mature, and the victim's part does not turn yellow; plants that are severely damaged will grow weaker and their cold resistance will drop significantly.
The onset of the disease occurs about six or seven generations a year. The nymphs or female adults become active during the winter and begin in early April of the following year. The first nymph of the newly hatched nymphs occurred in mid-April, the second generation appeared in late May to early June, the third generation occurred in early July, and the fourth to seventh generation overlapped, from August to early December. Both appear. Populations rapidly proliferate in May and June each year, peaking in September and October, and population density dropping sharply after November.
Copulation is mostly carried out at night. Female adults lay their eggs under the shell. Each female produces 30 to 90 eggs, an oviposition period of 7 to 14 days, female adults live for 40 to 60 days, and male adults only 4 to 5 days. The egg period is 12 to 14 days. The newly hatched nymphs crawl out from the shell at 9-12am in the morning, spread out, spread for hours, or after 1 and 2 days, feed on the appropriate part of the host, and the female nymphs become peeled after 2 peels. In adults, the male nymphs are exfoliated and preembryed and fleased into adults.
Papaya pods are mainly carried by wind or other insects for longer distances, and they can also spread with fruit and seedlings. The most suitable temperature for the development and reproduction of Papaya pupa is 26-28°C, so it is a large number in the summer and fall season and the damage is serious.
Control methods
(1) Remove the overwintering insects, remove the fallen leaves from the orchard, and apply the tree trunk with 5 times solution of pine oil mixture or 5-8 times of bone water.
(2) Conduct spraying control from April to June, and then pick up the treatment on the basis of this. Generally, each generation sprays 2 to 3 times, each separated by 5 to 7 days. The agent can be used 25% diaziphos 500 times or 40% dimethoate 300 ~ 500 times.
(3) Strictly check the seedlings when they are out of the nursery to prevent the insects from being brought into the field and new planting areas.

Calcium Metal

Metallic Calcium,Calcium Metal,Liquid Calcium

Polyurethane Catalyst,Rubber Auxiliary Co., Ltd. , http://www.wflonggang.com