Method and Technology for controlling Diseases and Pests of Chinese Roses
Core introduction of the text: Knowledge about the methods and technology for controlling diseases and pests of Chinese roses, read on!
Method and Technology for controlling Diseases and Pests of Chinese Roses
Common Diseases in the Cultivation of Chinese Roses
1. Black Spot Disease: This is a worldwide disease that often appears on the surface of leaves, and can also occur on peduncles. The lesions are circular, black or dark brown with a yellow halo. As the lesions merge, the leaves turn yellow extensively and are prone to fall off. Black streak-like spots appear on young branches and peduncles.
2. Downy Mildew: The pathogen infects the growing points of Chinese roses, causing irregular small brown spots on the leaves and a grayish-white moldy layer on the back of the leaves. The leaves gradually fall off, the diseased shoots wither, and similar symptoms appear on flowers, peduncles, and petals.
Main Pests in the Cultivation of Chinese Roses
1. Spiny Caterpillars: Mainly including the larvae of yellow spiny caterpillars, green bordered spiny caterpillars, beautiful brown spiny caterpillars, mulberry brown spiny caterpillars, and flat spiny caterpillars, which feed on most leaves during high-temperature seasons.
2. Scale Insects: Mainly including white轮 scale insects, Japanese wax scale insects, red wax scale insects, brown soft scale insects, cottony scale insects,糠片 shield insects, and snake eye scale insects, which harm the growth of young stems and leaves of Chinese roses by吸食 their sap, leading to poor plant growth and induced in environments with high temperature and humidity and poor ventilation.
3. Aphids: Common species include Chinese rose aphids and peach aphids, which absorb the sap of young plant organs, affecting the growth of young stems, leaves, and flower buds, thus impacting the growth and flowering of the plant.
Control of Diseases and Pests of Chinese Roses
1. Diseases: Choose disease-resistant varieties, keep relative humidity below 85%, ventilate frequently, apply nitrogen fertilizer moderately, avoid excess, prune diseased branches severely, remove overwintering pathogens from branches and leaves, spray black spot disease with bactericidal灵, and bactericide, spray downy mildew with metalaxyl-manganese zinc, Keku, and Anke manganese zinc, spray once every 10 days, and continue treatment for 2-3 times for better results.
2. Pests: Once spiny caterpillars are found, immediately spray with敌百虫 crystal or use cypermethrin emulsion for control. For the peak hatching period of scale insect larvae, use扑虱灵 for control, and for aphids, use pyrethrin wettable powder.
The detailed explanation of the methods and technology for controlling diseases and pests of Chinese roses mentioned above is for reference and suggestion only!