pest control

1. Scale insects, commonly known as blue lice, are the most common pests that harm orchids. After the damage, the growth weakens, the leaves wither, and its excreta induces mold growth, pollutes the leaves layer by layer, hinders the photosynthesis, and affects the normal growth and ornamental of orchid plants. It is found that the insect stem and leaves should be brushed or cut off manually, and during the peak egg incubation period, 40% omethoate, or 50% phoxim, or 50% dibromophos EC can be sprayed every 10 days or so, and the insect can also be sprayed with 20% dimethoate EC and 500-1000 times water spray for 3 times. In addition, tobacco stalks or garlic can be mashed and soaked in water for cleaning, which can also achieve certain results.

two。 Aphids (peach aphid, cotton aphid), thrips, aphids like to suck leaf juice, red spiders harm orchid leaves and eat less epidermis, resulting in small white spots on the leaf surface. It can be diluted 1000 times with 40% omethoate and sprayed every 5 ml every 6 days for several times to control the above three kinds of insect pests. In addition, Lindane and Tepp 2.5% deltamethrin EC can be diluted and released by 4000 times spray.

3. Red spiders rarely occur in orchid cultivation, but they also occur in places with strong sunlight, dryness and high temperature. The individual red spider is relatively small, less than 1 mm in length, reddish brown or yellowish yellow. Shaped like a spider, it can weave a web of current events. The reproductive ability is very strong, and the first generation can be completed after more than 30 ℃. The damage is serious. The piercing aspirator sucks the orchid liquid in the leaves, and the chlorophyll of the injured leaves is destroyed. In severe cases, the leaves are grayish yellow or produce necrotic plaques, which makes the orchid lose its ornamental and economic value completely.

Common species are: red leaf mite, citrus red spider, short beard mite and so on.

In the cultivation and management of orchids, pay attention to ventilation and water spraying to increase humidity, do not leave a dead corner, if each spray can not be sprayed, often in a dry state, it is easy to occur red spiders, especially in the winter heating room to the sun is the most likely to occur. If the quantity is relatively small, you can use manual brushing. The quantity is large, can spray 1000 times of dicofol, the effect is better, 80% dichlorvos EC, 40% omethoate 1000 times solution, good effect on adults, but ineffective on eggs, need to be sprayed several times in a row.

4. Whitefly is small, powdery all over the body, wings can fly, but not good at flying. Orchids with thin cuticular layers are sometimes found to be harmful to the leaves. The piercing mouthparts of adults and larvae are inserted from the back of the leaves to absorb the juice of the tissue, which makes the leaves withered and yellow, brown rot occurs in the wound, and even the whole plant dies.

Whitefly has strong fecundity and can form a large number in a short time. Due to the white waxy powder on the body, it is difficult to prevent and cure. Common species of whitefly, etc.

Spraying 25% deltamethrin, 10% permethrin, 20% chlorpromazine 2000 times liquid, the control effect is good. Among them, 25% deltamethrin has the best effect: 40% dimethoate, omethoate, 80% dichlorvos, 50% marathon emulsion, which has a good control effect on adults and larvae, but not on eggs. If you want to kill eggs, you need to use the medicine 2-3 times continuously, each time at intervals of 5-6 deaths.

5. Snails and including snails and demodex are molluscs. Snails have a hard shell to maintain their soft body, clam / no shell, these two kinds of animals mostly appear in the perennial damp and dark orchid temperature room, sexual shade afraid of wet, dry and strong light. Hide in dark and wet places during the day, come out at night and gnaw on the young leaves, roots and flowers of orchids. Because of the large amount of food, the whole Cartland can be eaten beyond recognition in one night. once a large number of occurrence, the harm is more serious.

When there are bright and transparent mucus lines on the leaves, the edge of the basin and on the bench, it can indicate the activity of such mollusks. Prevention and control method: ① poison bait: use skin mixed with arsenic, trichlorfon, etc., withdraw in their regular activities. Spray trichlorfon, deltamethrin and other pesticides or remove fresh ash and saturated salt water around orchids, tables and flowerpots. ③ should pay attention to the cleanliness of the site and remove the dead branches and leaves in time.

6. Earthworms people think that earthworms can adapt to the soil structure and make the basin soil loose and breathable to benefit the growth of orchid root, but they do not realize that the orchid root is sweet and coincides with the earthworm's stomach. the faults of eating the orchid root outweigh the merit, so it should be eliminated and prevented. The bottom of the basin is padded with masonry or the hole at the bottom of the basin is isolated with soup and brown. After it was found, the basin was irrigated with dimethoate diluted by 2000 times water, and then washed with dehydrated water or irrigated with soap horn water or turned over to change soil.

7. Ants enter the basin to make holes to harm Langen, the method of expulsion is the same as above, or use oily food to lure groups and then hunt and kill.