Hibiscus disease controlpowdery mildewPowdery mildew mainly harms the leaves of hibiscus. At first, many small spots will appear on the front of the leaves, which will gradually expand into large white powdery spots. In autumn, small black-brown spots will appear on the white powder. In severe cases, it can cause the leaves to turn yellow and wither, weakening the entire plant. Diseased plants should be burned promptly when found. In the early stage of the disease, they should be treated by spraying drugs, 2000 times diluted 25% oxycarboxin, or 1500 times diluted 70% thiophanate-methyl wettable powder. Hibiscus Pest ControlTussopus horned mothNewly hatched larvae will gather on the back of the leaves to feed on the mesophyll, leaving only the upper epidermis. After the third instar, they will disperse to feed and hibernate under the bark. Mature larvae will spin cocoons and become pupae on the back of the leaves. For prevention and control, you can scrape off the larvae that hibernate under the bark in winter. In early or mid-June, you need to spray pesticides. You can use 2500 times diluted 20% trichlorfon emulsifiable concentrate or 1000 times diluted 90% dichlorvos. Green leafhopperIt mainly harms the leaves, causing white spots to appear. In severe cases, it can cause the entire leaf to turn white and fall off, seriously affecting the growth of the plant. Weeds should be removed around the plants to destroy the places where pests and diseases overwinter. During the peak period of the first outbreak, spray 1500 times diluted 50% carbofuran, 50% chlorpyrifos, pyrethroid insecticides, or 1500 times diluted 50% malathion. Tetranychus cinnabarinusIn the early stage of the disease, the affected leaves appear as small yellow-white spots, which slowly spread to the entire leaf, causing it to turn yellow, curl, and fall off. Spray 1500 times diluted 40% oxydemeton-methyl on the back of the leaves for prevention and control. Other pestsOther insects that harm hibiscus include aphids, red spiders, scale insects, etc., which can be controlled by spraying 100 times diluted 50% DDT, 100 times diluted 50% dicofol, or 2500 times diluted 20% cypermethrin. Pest and disease control is a big lesson we need to learn. I hope the methods introduced above can help everyone. I hope everyone can grow healthy and beautiful hibiscus. |
<<: What are the pests of Milan flowers?
>>: Common pests of Malus chinensis
1. Breeding methods 1. Water: Appropriate water i...
Family farming methods Sowing time It is usually ...
1. Timing of dividing the pot When the seedlings ...
As long as it does not affect ventilation and doe...
1. Different varieties The German iris is one typ...
Stop fertilizing during dormancy period After the...
Mango is a very common fruit. The remaining cores...
1. Epidermal Difference There are obvious differe...
The ornamental value of medal flowers The medal f...
The pedicels of the Songzhimeng rose are thick an...
Rubber tree repotting time Generally, a newly pur...
Gardenia Growing Conditions When planting gardeni...
1. Causes of seedling stagnation 1. Soil compacti...
Platycodon grandiflorum planting area Generally, ...
Sunflower - Orange Hibiscus The orange hibiscus i...