Disease control of Oncidium

1. Mosaic disease

Symptoms: yellowish spots appear on the leaves at the initial stage. Then the disease spot will lead to leaf necrosis, the leaf on the formation of sunken brown necrotic spots, gradually withered.

Solution: clean up the diseased leaves in time, avoid the growth environment of high temperature and humidity, properly increase the application of phosphorus and potassium fertilizer, Bordeaux solution and methyl thiophanate solution can be sprayed.

two。 Grey mold disease

Symptoms: Botrytis cinerea occurs on leaves and petals, causing petals to produce small spots, and then gradually expand into round brown spots. In severe cases, the disease spot will spread to the entire petals, withering the flowers, and gray moldy layers will appear on the leaves and petals.

Solution: maintain good ventilation conditions, avoid the production of bacteria, spray fungicides in time.

Control methods of Diseases and insect pests of Oncidium

The insect pests of Oncidium are mainly scale insects. The shellfish parasites on the leaf edge or leaf surface of the plant to absorb sap, which causes the plant to wither, and in severe cases, the whole plant will wither and die. You can spray 40% omethoate 1000 times or 50% marathon EC 2000 times. The main diseases of Oncidium are soft rot and leaf spot. When leaf spot occurs, it harms the leaves of Oncidium, and when soft rot occurs, it will kill the whole plant. It can be controlled by 1000 times of carbendazim and 50% methyl thiophanate soluble wet agent.

Common insect pests and control methods of Oncidium

Oncidium has a lot of insect pests, but the most serious damage is scale insects. There are many species of scale insects, and the damage degree is different in different environments. Xiaobian will show you about it!

Oncidium pest: coffee gray scale

This small scale insect, which is gray or brown in color, is mainly parasitic on the leaves, mostly on the back of the leaves, sucking on the sap of the plant. When the damage of coffee scale is serious, the whole leaf is dense, which not only consumes the nutrients of the plant, but also causes coal fouling disease because of excrement, which affects the ornamental value.

Prevention and control methods: strengthen maintenance, timely ventilation, and rinse with clean water when insect bodies are found. When the disease occurs in a large area, it can be sprayed once every 10 days and once every 3 times. The drugs you can choose from are omethoate and dichlorvos.

Oncidium pest: White shield scale

This is the most common pest of Oncidium. The worms are white, with white bulges around them. The insect body is small, 1.5-2mm, and the harm is more serious. It mainly occurs in the short variety of Oncidium, when it is serious, the leaves will be covered with white, affecting the accumulation of photosynthetic nutrients.

Control method: when a small amount of white shield scale is found, scrape it off with bamboo in time, or wash it with detergent solution. If there are more white bugs, spray chemicals in time.

Oncidium pest: tumor oyster scale

The oyster scale is about 2 mm long and is yellowish brown. It is fixed on both sides of the leaf to absorb juice, which makes the leaf lose its luster and affects its growth and ornamental value. The oyster scale appears 2 or 3 times a year, and it is more serious in the second half of the year.

Control methods: keep ventilation, control watering, keep leaves dry at night; spray chemicals in time, please refer to coffee gray scale for details.