Tips for the prevention and control of orchid leaf spot and common physiological diseases of orchids
Orchid leaf spot is a fungal disease harmful to leaves, which can occur in the whole growing period. High temperature and humidity, damaged by scale insects, mainly parasitic on the stems and leaves of orchids. Leaf spot disease is easy to occur in patients with poor ventilation. The root can be irrigated with Genshitong capsule combined with 1000 times of dichlorvos EC.
The initial stage of leaf spot is brown spot, after enlargement, the spot is long oval to striped, the edge is reddish brown, and the inside is grayish brown. In the later stage, black grains are scattered on the plaque. It should improve ventilation conditions and use tree protection generals to eliminate pests. The initial stage of the disease was sprayed with 500x solution of new high-fat membrane or 1000-fold solution of 50% acetaminophen and 65% Dysen zinc. (grass)
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