Pest control of Sijilan (Jianlan)

The insect pest of Cymbidium is more serious than other orchids. Because its florescence is concentrated in summer and autumn, high temperature and dry, fragrant flowers, often attract many insects to gnaw on its petals and juice, of which thrips are the most serious, which occur throughout the year. The larvae are pink and the adults are black. About 2mm, like a flea. The main damage site is flower. Causing the petals to show brown spots. In serious cases, the bud does not open and die. Thrips like to hide in the base of the petal and the leaf sheath of the new buds, and when there is no flower, they hide in the gap between the bulbs to harm the buds, and the marks of damage are found at the opening of the new buds, which are white spots in the initial stage, like the symptoms of toxin disease. After growing up, it appears brown. It even causes the leaves to shrink and twist. These wounds often cause other germs and toxins to invade.

Followed by shellfish and aphids. In the leaf base, leaves, pedicels can be harmful, and symbiosis with ants, specially sucking plant sap, resulting in yellow spots on the leaves, early withering and falling, and will occur almost throughout the year.

The second is the golden flower insect, which is specially harmful to the bud, its body color is golden yellow and its body length is 12~18mm. When the orchid bud is eaten up, the insect is no longer found.

The above-mentioned pest control methods are the same, when serious occurrence, in addition to the removal of flowers, once a week, twice in a row. Control agents can be used omethoate, Nanade, Butyl Plus, Dasong, Taosong, Marathon, Bomonine and other agents to choose one. The dose is allocated according to the instructions.

Molluscs such as nematodes, slugs and cochlea are harmful to roots and stems, among which perforated nematodes are the most serious, which not only cause root rot, but also destroy the bulb growth point without budding. Molluscs such as slugs and cochlea eat new roots and buds. These animals have a common characteristic, their skin will secrete oil for gliding and breathing, the use of fat-free detergent, soapy water, dishwashing essence or soybean powder, bitter tea meal and other natural medicines can achieve good results. Soybean powder and bitter tea meal should be soaked and dissolved in edible vinegar or sweet and sour solution, and their juice should be diluted 200 times and infused or soaked. Chemicals can be treated with polyethylene suppositories and Wanqiang. It is highly toxic and should be used with caution.

Pest control, in addition to active pesticide culling, negative removal is also a good strategy, such as hanging cyan, white or yellow adhesive tape, can reduce the harm of thrips and flying insects. Sprinkling lime on the ground or putting a special bottle on the strut of the bed frame can prevent the invasion of cochlea, and sweet and sour liquid can eliminate red spiders, wood vinegar and alcohol. Natural organic compounds with pungent flavors such as garlic juice, chili juice, bitter oil, camphor oil and citronella oil are also very effective in repelling insects.

Pest control must be wiped out. After killing a batch, there is still a new batch of invaders outside. The human body has been exposed to pesticides for a long time, which is very harmful to human health. The use of organic pesticides and physical control, gradually becoming the mainstream of modern agricultural science and technology, there are still many good ways to be developed. (Wu Senyuan, Taiwan)