Pest control of Phalaenopsis

1. Leaf spot disease mainly occurs on the leaves, small spots appear on the leaves at the beginning of the disease, and then develop into a nearly round spot, with a water-stained yellow circle on the edge of the spot with obvious boundaries. Prevention and treatment methods: strengthen ventilation, reduce air humidity, cut off diseased leaves. During the onset period, the disease was sprayed with 800 times of 75% chlorothalonil wettable powder, once every 10 days, for 3 times.

2. Botrytis cinerea: occurs in spring when low temperature and high humidity, generally appear on the petals of white flowers brown spots, serious soft rot phenomenon. Prevention and treatment: strengthen ventilation, reduce humidity, and immediately cut off diseased flowers. The initial stage of the disease was sprayed with 1000 times of methyl topiramate wettable powder, once every 10 days, twice in a row.

3. Brown spot: it occurs in the hot and humid weather in summer and autumn, mainly on the leaves, the leaves appear small round spots at the beginning of the disease, and then gradually expand into large spots, the disease spots are dark brown, and when the leaves are serious, the leaves become black and wither. Prevention and treatment: pay attention to ventilation and light transmission. At the initial stage of the disease, 10% Polyaniline (polyantimycin) 80 times solution was sprayed once a semimonthly.

4. Scale insects: the most common insect pests of Phalaenopsis occur in autumn and winter, indoor ventilation is not smooth, and dryness leads to the harm of shell insects. Control methods: pay attention to ventilation, orchid plants should not be placed too dense, found that a small amount of soft cloth can be used to scrub shell insects, repeated several times can eradicate insect pests. Extracted from the Treasure Book of Orchids