The common pests and diseases of M. hibiscus mainly include:
1 Hibiscus powdery mildew. The main harm to the leaves, serious damage can cause plant weakness and leaves yellow, premature. 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 at the end of autumn; b. Apply 25% triadimefon 2000 times spray at the beginning of onset, or 70% thiophanate-methyl wettable powder 1500 times spray.
2 spot venom moth. The newly hatched larvae clustered on the back of the leaves, fed the leaves and left only the epidermis. The 3rd instar larvae dispersedly fed. The mature larvae sloughed off on the back of the leaves; before winter, the 3rd instar larvae overwintered 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.
3 small green leafhoppers. The adults and nymphs sucked the sap of the plants, resulting in the appearance of small white spots on the damaged leaves. In severe cases, the entire leaves were 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 or 40% of sulphate 1500 times.
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