Pest and Disease Control of Kushi Rose
As a unique medicinal rose variety in the northwest region, Kushi rose often faces various threats from pests and diseases during cultivation. These pathogens not only affect plant growth but also reduce the yield of essential oils and the quality of petals. This article systematically sorts out the characteristics and control measures of three typical pests and diseases, helping growers establish a scientific protection system.
Complete Guide to Rust Disease Control in Roses
Symptom Identification and Occurrence Patterns
After the temperature rises in May each year, orange spots appear on the leaves, which gradually expand into rust-brown patches as humidity increases. The pathogen spores spread through wind and rain, and dense powdery spore piles can be seen on the back of leaves during the peak period from June to July, turning black-brown winter spores after September.
Comprehensive Control Measures
Remove the affected leaves immediately upon discovery, spray 25% triazole wettable powder at a dilution of 1500 times every week, focusing on the back of the leaves. After winter pruning, clean the garden with lime sulfur solution and supplement with phosphorus and potassium fertilizers to enhance the plant's resistance to diseases.
Techniques for Controlling Aphid Populations
Pest Characteristics and Damage
Green aphids聚集 on the tender buds, causing the leaves to curl by piercing and absorbing sap, while also secreting honeydew that induces sooty mold. When the number of aphids per plant exceeds 200, the growth of new shoots will completely stop.
Biochemical Combined Control
Initially, hang yellow sticky traps to monitor and release ladybirds and other natural enemies for biological control. During outbreaks, alternate the use of 10% imidacloprid at a dilution of 2000 times and 25% thiamethoxam water-dispersible granules, making sure to spray thoroughly in hidden leaf axils.
Key Points for controlling grub larvae
Life Habits of Grub Larvae
White C-shaped larvae overwinter at a depth of 10-15 cm in the soil, and in spring, they eat the roots, causing the plants to wilt. Adult beetles emerge in May and gather at night to eat the tender leaves, creating net-like notches.
Physical and Chemical Dual Control
Shake off adult beetles at dusk for centralized extermination and set up black lights around the field to attract them. Soil treatment involves using 5% phoxim granules at a rate of 3 kg per mu in furrows, and foliar application of 4.5% lambda-cyhalothrin at a dilution of 1500 times to block the food chain.
By establishing a pest and disease warning system, combining agricultural, biological, and chemical control methods, the losses in Kushi rose cultivation can be effectively controlled. It is recommended to conduct systematic inspections monthly, keep records of pest dynamics in a control log, and implement agronomic measures such as crop rotation for ecological fine management.