A Summary of Disease and Pest Control

The orchid cultivation place is suitable, the maintenance method is good, the plant is strong, the occurrence of diseases and insect pests is naturally less, otherwise, diseases and insect pests are easy to occur.

In order to prevent diseases and insect pests, the first is to avoid the purchase of diseased plants, the second is to strengthen maintenance, the third is to often spray pest control agents, implement the principle of giving priority to prevention, prevention is more important than treatment, the impact of diseases and insect pests is reduced, and the success of orchid cultivation is guaranteed.

Common diseases

The main results are as follows: 1. Black spot appears on the leaf surface, which gradually expands and makes the leaf dry. In most cases, the water is too wet and not ventilated. Pre-move to a ventilated place and spray with fungicides.

2. Rot, caused by Pythiumultimum, usually harms seedlings. Spray with copper sulfate or other fungicides.

3. Bacterial brown rot mainly occurs on new leaves and newborn pseudobulbs. At the initial stage of the disease, water-stained spots first appear on their leaves or pseudobulbs, initially light brown, gradually become dark brown, the surface is folded, and wet halos appear around them. The disease develops rapidly. If you get sick in the morning, you can turn yellow and white in the evening, and the next day it will endanger the whole plant. The diseased site should be completely cut off and burned. Then disinfect with a liter of mercury water and stop watering for four or five days.

4. Viral disease. RTHK calls it Buras disease. There are mainly orchid mosaic virus (Cymbidium mosaic) and orchid spot virus (Cymbidium diamond Mottle). A disease usually transmitted by aphids that spreads quickly and must be thoroughly cleared and disinfected once found. Usually pay attention to the prevention and control of aphids.

Common insect pests

1. Scale insects usually occur in Diaspis boisduvalii Sigmoret, Ferrisiana virgats Cookerell and Lepidoaghes machili Maskell. Dimethoate and Didi can be sprayed and killed when larvae are used. The effect is very good with Swiss-made Nuvacvom60.

2. Mites and spiders, small software animals, round, milky white eggs, lay 1 or 2 eggs a day, hatch in 5 days, and develop into adults in 1 week. It can be controlled by acaryl alcohol, 1605, malathion and other agents, and the effect is better.

3. Thrips (Thrips), which harms the orchid leaves and absorbs the epidermis so that the leaves have small white spots. The common one is Anaphothvips Qrchidii Moulton. Lindane and 1605 were used to control the disease.

4. Aphids should be observed and controlled from time to time because they are virus vectors. Common species such as Ceratapis Laniae Boisduval,Myxus Persicae Sulzer (peach aphid), M.Circumslexus Buckton (lily aphid) and Aphis gossypil Glover (cotton aphid) can be controlled by TE-PP, 1605, malathion and lindane. (he Qingzheng)