Pest Control of Cymbidium (2)

5. Whitefly

Whitefly is a pest of the family Homoptera, which is small and has white powdery wax all over the body. It is usually clustered on the orchid plant and is easy to occur in the orchid shed with poor ventilation. It often harms the new buds, tender leaves and flower buds of orchids, which is inserted from the back of the leaves with a prick aspirator to absorb the sap from the plant tissue, making the leaves withered and yellow, and often excrete a large amount of honeydew in the wound, resulting in coal pollution and brown rot, even causing the death of the whole plant. Because of its strong fecundity, whitefly can reproduce 9 to 10 generations a year in the greenhouse, forming a large number in a short period of time.

Prevention and control methods:

(1) due to the white waxy powdery substance on the body of the adult whitefly, the nymph stage is better for drug control. 2.5% deltamethrin, or 10% permethrin, or 20% dimethrin diluted 2000 times is more effective.

(2) you can also use 40% dimethoate, or 40% omethoate, or 80% dichlorvos, or 50% marathon emulsion once every 5 to 6 days, spraying 2 times in a row.

(3) the dominant natural enemy, aphid wasp, etc., can also be used, and it also has a certain effect.

6. Leaf miner

Leafminer is a pest of the family Liriomyidae. The larvae are maggot-shaped, white, with a body length of about 3 mm, and most adults appear in early spring. During the damage, the adults lay eggs and develop into larvae in the leaf margin tissue, and the larvae latent feed on the mesophyll, forming white linear irregular latent marks, showing a tunnel shape. It not only destroys the leaf tissue and makes the orchid lose its ornamental value, but also the damaged part is easy to produce black rot, which leads to the decay and death of the whole leaf and even the whole plant. Leaf miner can harm many species of Magnolia, but Paphiopedilum is the most serious.

Prevention and control methods:

The main results are as follows: (1) the control of leaf miner can be killed by the dark end of the needle tip at the initial stage, and the insect leaves should be removed and destroyed in time when it is more serious.

(2) when using pesticide control, 40% dimethoate emulsion or 40% omethoate emulsion 1000 times, or 50% parathion emulsion 1500 times, or 50% dichlorvos emulsion 1000 times, once a week, three times in a row.

7. Caterpillar

Larvae of Lepidoptera butterflies or moths. They nibble on the new buds, new roots, new leaves and young tissues such as inflorescences, buds and petals of Cymbidium. Generally, the parts harmed by them are difficult to restore to their original state. There are two ways for caterpillars to harm Dendrobium orchids: one is that the caterpillars quickly climb to the orchid seedlings from around the orchid field in the early morning, and the short-term wind devours the young tissues of the orchids; second, during the day, butterflies or moths first lay their eggs around the young tissues of the orchids, and then swallow the new buds after hatching. Such as moths called cloth bagworms, their larvae can weave a "cloth bag" on the orchid plant and gnaw on the leaves, flower buds or petals of the orchid plant.

Prevention and control methods:

(1) the prevention and control of caterpillars should give priority to prevention, remove weeds around the basin or orchid farm, and sprinkle a small amount of quicklime on the ground passageway where the caterpillars crawl.

(2) to drive away butterflies or moths that fly into the orchid shed to prevent spawning and carry out manual hunting.

(3) regular spraying of 1000 times of omethoate emulsion or 1000 times of 50% dichlorvos emulsion.

8. Cockroach

The cockroaches that harm orchids are divided into house cockroaches and wild cockroaches. They endanger the root tips and buds of orchids. They generally hide in orchid pots or among things during the day and come out at night.

Control methods: cockroaches have strong reproductive ability and drug resistance, generally giving priority to prevention. First of all, to prevent it from hiding in the orchid basin, you can put a layer of fine-hole plastic screen at the bottom of the basin to prevent cockroaches from entering. When it has happened, the whole basin can be immersed in omethoate with a concentration of 1000 times for 5 minutes to kill cockroaches. In addition, boric acid and sugar can be used to make a paste trap, and other agents can also be used to spray and kill.

9. Ants

The harm of ants to orchids is mainly manifested in that often nesting in orchid pots can cause damage to the growth of roots and leaves of orchids.

Control method: 80% dichlorvos 800 times solution can be used to irrigate the nest at the bottom of the basin, or it can be sprayed with orchid plants for control.

10. Snails and slugs

Snails and slugs belong to molluscs. Snails have a hard protective shell. Slugs have no shell and have a generation every year. Most of these two kinds of animals hide in dark and wet places during the day and come out at night, especially in the early morning or evening after heavy rain to eat orchid roots, young leaves and flowers. Because of its large food intake, it is often possible to eat up the whole orchid seedling in one night. Snails and slugs will leave bright traces of transparent mucus lines in the leaves of orchids when they climb out of date, affecting the ornamental value of orchids. Snails and slugs often hide in stone gaps and basin gaps at low temperatures in winter.

Prevention and control methods:

(1) at ordinary times, attention should be paid to the cleanliness and hygiene in the greenhouse, and withered branches and leaves should be removed in time, and once they are found, they should be caught and killed manually, and poison bait should be used to kill snails, and wheat bran should be mixed with arsenic, trichlorfon, etc., sprinkled in places where they often move.

(2) Trichlorfon and deltamethrin can also be sprayed around the orchid plant, on the bench and on the flowerpot, or tea cake water can be poured around the orchid rhizosphere, or sprinkle on the surface of the medium with 8% vermicellin granules, quicklime, 6% polyacetaldehyde particles, saturated salt water, etc.

(3) 1000-1500 times of 50% phoxim, 80% dichlorvos and 40% omethoate can be sprayed once every 5-7 days for 3 times in a row.

(4) when planting at home, put several plates of beer around the orchid plant before evening, and the slugs can be seen drunk to death in the next morning.

11. Earthling

Earthwork introduction is beneficial to loosen soil and improve soil fertility, but the growth of orchid plants will be stagnated due to swallowing the young roots of orchid plants or damaging the young roots of orchid plants in the process of drilling holes and sneaking back and forth.

Prevention and control methods: chlordane or heptachlor, carbaryl powder 1.0 ~ 1.5g per square can be used, or tea cake water at 1:15 can be used to get good results.

12. Mice

The harm of rats to Cymbidium is mainly manifested in eating Cymbidium seedlings, medium seedlings and even large seedlings, as well as flower buds, spikes, buds, and even pseudo-bulbs of flowering plants, affecting the growth of orchid plants, reducing yield or affecting ornamental value.

Prevention and control methods: poison baits such as rodent exterminator, electric cat or warfarin can be used to kill.