Autumn flower pest control
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Flowers come in a wide variety, and the types of pests and diseases that affect them differ in severity and impact. According to a recent survey, the most common flower species and insect pests in our city include leaf spot, melasma, anthracnose, blight, powdery mildew, scale insects, aphids, thrips, longhorned beetles, wood moths, whiteflies, spotted flies, maggots (including red spiders and crickets), and nematodes. Leaf spot disease primarily affects camellias, sweet-scented osmanthus, eucalyptus, orchids, pineapples, Podocarpus, and San Weikui. The average infection rate is between 15% and 30%, with some cases exceeding 50%. Black roses, chrysanthemums, and other flowers are also frequently affected, with damage rates ranging from 20% to 40%.
Anthracnose is another widespread disease, affecting various flower species such as orchids, evergreens, camellias, Milan, olivias, rubber trees, white orchids, clivias, bamboo worms, and palm flowers. The leaf damage rate can range from 10% to 30%, but in severe cases, it can reach up to 90%. Powdery mildew commonly attacks crape myrtles and peonies, while wilt disease mainly impacts palm plants during the seedling stage, as well as chrysanthemums.
Insect pests are among the most prevalent threats. They often attack cycads, hibiscus, white osmanthus, sweet-scented osmanthus, camellias, jasmine, eucalyptus, Fujian tea, and brown bamboo. In densely planted or shaded environments, infestations can become severe if not controlled promptly, leading to defoliation, branch death, and even plant loss.
Aphids, including red spiders and crickets, affect a variety of plants such as citrus, eucalyptus, marigolds, roses, and cycads. Autumn is their peak season, so timely pesticide application is essential. Locusts and leafhoppers often cause damage to plants like the imitation umbrella and bamboo. Hornworms and wood maggots tend to attack eucalyptus, imitation umbrellas, and cycads after transplanting, with damage rates typically between 10% and 40%. Locusts and spotted larvae mainly harm chrysanthemums, peonies, and rhododendrons. Nematodes are more difficult to detect but commonly affect evergreens, palms, chrysanthemums, and even tall trees, causing root and stem rot. Nematodes can also interact with Fusarium, spreading severe blight.
Prevention is key in managing flower pests and diseases. Efforts should focus on early detection and minimizing re-infection within the garden. It’s important to avoid water source contamination, which can worsen disease outbreaks. Timely and appropriate treatment is crucial for effective control.
First, in the flower field, it's essential to remove diseased and damaged leaves regularly. Use clean water for irrigation and plan the planting layout carefully to reduce the spread of pests and diseases. Second, apply the right pesticides at the right time. For leaf spot and black spot diseases, use thiophanate-methyl, carbendazim, mancozeb, or copper oxychloride. For anthracnose, products like Shibaogong or zinc sulfate are effective. For powdery mildew, consider options like myclobutanil, wettable powder, or triadimefon.
For insect pest control, scale insects can be managed with dimethoate or imidacloprid. Aphids can be treated with bufalin, konjac, or amitraz. Whiteflies and pupae can be controlled using imidacloprid or nitenpyram. For larvae, insecticidal soap or Bt (Bacillus thuringiensis) can be effective. Carbofuran and milur are useful for controlling larvae. For borers, in addition to surface spraying, you can use soil drenching or inject pesticides directly into the tree trunk.