Autumn flower pest control
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Flowers come in a wide variety, and each type is susceptible to different pests and diseases. According to a recent survey conducted in our city, the most common flower species and associated pests include leaf spot, melasma, anthracnose, blight, powdery mildew, scale insects, aphids, thrips, longhorned beetles, wood moths, whiteflies, leafhoppers, caterpillars (including red spiders and crickets), and nematodes. Leaf spot disease primarily affects camellias, sweet-scented osmanthus, eucalyptus, orchids, pineapples, podocarps, and San Weikui. The infection rate can range from 15% to 30%, with some cases reaching over 50%. Black roses, chrysanthemums, and other ornamental flowers are also frequently targeted, with damage rates between 20% and 40%.
Anthracnose is another widespread fungal disease that affects many flower species, including orchids, evergreens, camellias, Milan, olives, rubber trees, white orchids, clivias, bamboo, and palm flowers. The leaf damage rate typically ranges from 10% to 30%, but in severe cases, it can reach as high as 90%. Powdery mildew commonly occurs on crape myrtles and peonies, while wilt disease mainly affects palm seedlings and chrysanthemums.
Among insect pests, scale insects are among the most prevalent. They often attack cycads, hibiscus, white osmanthus, sweet-scented osmanthus, camellias, jasmine, eucalyptus, tea plants, and bamboo. In densely planted and shaded environments, these pests can cause severe damage if not controlled promptly, leading to defoliation, branch death, or even plant mortality.
Aphids, also known as red spiders or crickets, affect various flowering plants such as citrus, eucalyptus, marigolds, roses, and cycads. Autumn is their peak season, so timely pesticide application is essential. Leafhoppers and grasshoppers often infest young plants, while wood borers and larvae damage eucalyptus, imitation umbrellas, and cycads after transplanting, causing damage rates of 10% to 40%. Locusts and spotted larvae mainly harm chrysanthemums, peonies, and rhododendrons.
Nematodes are more difficult to detect but are common in evergreen plants, palm family species, chrysanthemums, and even tall trees. They cause root and stem rot, and often coexist with Fusarium, worsening the spread of blight.
To manage pests and diseases effectively, prevention is key. Gardeners should regularly remove infected leaves, use clean water for irrigation, and arrange planting layouts to reduce the spread of infections. It's also important to avoid contaminating water sources, which could worsen disease outbreaks. Timely and appropriate treatment is crucial.
In practice, gardeners should clear diseased leaves regularly, ensure clean irrigation water, and plan planting arrangements to minimize disease transmission. For disease control, leaf spot and black spot can be treated with thiophanate-methyl, carbendazim, mancozeb, or copper oxychloride. Anthracnose can be managed with Shibaogong or zinc sulfate. Powdery mildew may be controlled using triadimefon or wettable powder.
For insect pests, scale insects can be treated with dimethoate or imidacloprid. Aphids respond well to bufalin, neem oil, or amitraz. Whiteflies and larvae can be controlled with imidacloprid or chlorpyrifos. Caterpillars can be managed with Bt or spinosad. For borers, in addition to surface spraying, soil drenching or bait mixing methods can be used for better results.