Common hibiscus prevention and treatment

The wood powdery mildew disease mainly damages the leaves. When the damage is severe, it can cause the plants to become weak and the leaves turn yellow and early dry. There were multiple small spots on the front of the early leaves, followed by small spot sinks to synthesize white powdery spots without obvious edges, and dark brown particles on the white powder at the end of autumn. Control methods: a. Remove diseased plants and burn them at the end of autumn; b. Spray with 25% triadimefon 2000 times or 70% thiophanate-methyl wettable powder 1500 times in the initial stage of disease.

The newly hatched larvae of P. ostreatus cluster on the back of the leaf, feeding on the leaves but leaving only the epidermis. The 3rd instar larvae disperse and feed. The mature larvae scab on the back of the leaves; before winter, the 3rd instar larvae overwinter under the bark. Control methods: a. scrape the overwintering larvae under the bark in winter; b. use 20% triclosan EC 2500 times, or 20% fenvalerate 2500 times, or 90%, in the middle and middle of June. Trichlorfon 1000 times spraying.

The small green leafhopper sucked the sap of adults and nymphs, resulting in small white spots on the damaged leaves. When the leaves were severe, the whole leaf was pale and early deciduous, which affected the normal growth and ornamental value of the plants. Adults lay their eggs on the main veins, new shoots or petioles in the leaves, and the nymphs inhabit the leaves on their backs. Control methods: a. Remove the weeds around the plants, eradicate the overwintering areas, and reduce the number of insect populations in the second year; b. Use the 50% killer pine, 50% parathion, and pyrethroids before the first occurrence of the peak period. Insecticides were sprayed 1500 times each, or 50% of malathion 1500 times.

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