Symptoms: it is mainly harmful to the leaves of canary. Adults and larva will absorb the juice of leaves, stems, young heads and young ears. In the early stage, the leaves will shrink, leading to a large amount of nutrient loss and withering.
Control: for aphids, 10% Omethoate emulsion 1000 times or Mara sulfur emulsion 1000-1500 times can be used for spraying.
Symptoms: it mainly sucks the sap from the stem of the plant, causing the damage of chlorophyll and the yellowing of the leaves. When seriously damaged, it will cause the leaves to fall off or even lose light.
Prevention and control: if only a few leaves are damaged, we can remove them directly. If the damage is serious, we need to spray 1500 times of 40% dimethoate emulsion to the plants for prevention and control, so as to eliminate the pests at one time.
Symptoms: some plaques will appear on the leaves of the injured plants, and may increase and deepen in the later stage.
Prevention and control: when dealing with the disease, 50% carbendazim WP 500 times liquid can be used to spray the disease plant. Spray once every 7-10 days, generally 3-4 times after the recovery.
Symptoms: rust is very harmful. There will be large area of brown patches on the affected leaves, which will gradually expand and deepen in the later stage, eventually leading to plant death.
Prevention and control: in the prevention and control of this disease, we need to use 12.5% diniconazole wettable powder 2000-3000 times to spray on the disease plant, spray once every 10-15 days, spray 2-4 times continuously, and then it can be cured.
