Recently, many farmers have reported that there are locusts everywhere in the field, and the number of fights is also quite high, but the number of mites has not decreased. Why is this? What are the harmful symptoms and characteristics of mites? How to prevent it?
First, the harm symptoms of mites
1, aphids, also known as greasy insects, often clustered on the back of the young leaves to absorb juice, severely caused by curling and shrinking deformation of the leaves, and even dry, seriously affecting the normal growth of the top shoots.
2, flower buds and flowers are also dense parts of mites, and peach mites can also spread viruses.
Second, the characteristics of locusts
1, aphids, omnivorous, host more, wintering hosts are mostly Rosaceae woody plants (such as peach, plum, plum, apricot, cherry, etc.), summer host mostly herb (except for legumes, Solanaceae, Cucurbitaceae In addition to vegetables such as cruciferous, it also includes many one-and-two-year-old herbaceous ornamental plants, especially greenhouse flowers.
2, aphids are parthenogenesis, rapid reproduction, from the winter host to the second host potato and other plants.
3, 10-20 generations can occur every year.
4, the locusts fly by the winged scorpion.
5. Winged crickets generally migrate or spread to potatoes in April and May.
6. Fertility is the fastest when the temperature is around 25 °C. When the temperature is higher than 3 °C or lower than 6 °C, the number of aphids decreases.
7. Heavy rain and rainy seasons are not conducive to the reproduction and migration of aphids.
8. The peach aphid flies back to the first host peach tree at the end of autumn to lay eggs for winter.
9. Overwintering eggs are moved to the second host hazard after winging in the spring.
10. Sometimes adult nymphs or nymphs overwinter in vegetable, greenhouse, and impotence.
11. Myzus persicae has strong tropism for yellow and orange, but negative for silvery gray.
Third, prevention and treatment methods
1. Agricultural control
(1) In order to prevent the transmission of mites, in the second season, the spring should be harvested before the locusts move, avoiding the locust damage.
(2) In addition, after emergence, it is required to spray once a week.
2, chemical control
(1) The imidacloprid wettable powder can be added with water 2000 times, or 40% dimethoate emulsion plus water 1000 times, or acephate phosphorus plus water 2000 times, or 50% anti-weiwei water 2000 times, or the fucai pine emulsion plus water 1000 times. Or 2.5% of the 2500 times solution.
(2) There are many cockroach remedies, which can be rotated according to the situation, so as to avoid the resistance of mites and affect the control effect.
(3) Because aphids breed quickly and spread rapidly, they must be prevented in time.
(4) Most of the mites are harmful in the heart leaf and leaf back. It is difficult for the medicinal agent to be sprayed completely, so it should be thoughtful and meticulous when spraying.
The above are the hazard symptoms, characteristics and control methods of locusts. Farmers often encounter mites during the planting process. If they are serious, they may lead to crop yield reduction and economic loss. Therefore, farmers must pay attention to it and prevent it in time. .
For the wonderful pictures and popular comments about locusts, you may be interested in the following recommended contents, please read.
PVC
Coated Wiggle Wire will help to ensure that your greenhouse can weather the
elements and last for years. Unlike other attachment methods, Wiggle Wire will
hold up to high winds and harsh environments. Protect your investments by using
the right products. The PVC Coated Wiggle Wire prevents tears for a fast
frustration free installation. This Spring Wire is the superior choice of
Wiggle Wire compared to the non-coated version. The PVC coating prevents tears
and is easier to handle. It is reusable and can easily be installed and removed
by "wiggling" it in and out of the Lock Channel. For use with poly
greenhouse film, curtains, shade cloth and other greenhouse coverings.
Plastic Coated Steel Wire,Plastic Coated Wire,Pvc Coated Wire Mesh,Plastic Coated Wire Mesh
JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.greenhousehydroponic.com