Cornflower Disease and Pest Control
Cornflower, as a widely popular ornamental flower, its disease and pest control is the key to ensuring the health of the plant. This article focuses on the three common diseases in the process of cornflower cultivation, combined with control images and practical skills, systematically analyzes the symptom characteristics and solutions, helping you create a flourishing cornflower garden.
Key Points for Control of Cornflower Sclerotinia Disease
Symptom Identification and Occurrence Regularity
Sclerotinia disease mainly harms the stem base, initially presenting as light brown spots, which turn into grayish-white rot as the condition progresses. When the ambient temperature stabilizes at 15°C and humidity remains high, the disease is likely to outbreak in spring and autumn, leading to the withering and death of the entire plant.
Comprehensive Control Plan
Maintain a plant spacing of 30-40cm to enhance ventilation and light, use ripe organic fertilizer combined with phosphorus and potassium fertilizers to enhance disease resistance. Immediately remove the diseased plants with soil and sprinkle quicklime to disinfect the affected area. During peak outbreaks, spray the stem base with a 50% carbendazim solution diluted 800 times.
Cornflower Downy Mildew Control Technology
Disease Characteristic Diagnosis
Gray-green water-stained spots appear on both sides of the leaves, with irregular reddish-brown halos on the edges. Under continuous rainy weather, a white downy mildew layer is visible on the back of the lesions, which can cause leaf curling and falling in severe cases.
Three-dimensional Control Measures
Build a rainproof shed to prevent leaf accumulation of water, and spray the leaf surface with water early in the morning to rinse off spores. For chemical control, use a Bordeaux mixture of 1:1:200 or a 72% metalaxyl-manganese zinc solution diluted 600 times, focusing on spraying the back of the leaves, for three consecutive applications at 7-day intervals.
Cornflower Verticillium Wilt Systematic Control
Typical Symptom Manifestation
Viral diseases cause leaves to twist and deform in a spiral shape, leaf veins to turn brown and die, and the plant to dwindle and stop growing. The disease is transmitted by piercing-sucking insects such as aphids and leafhoppers, and the transmission speed accelerates during the hot summer months.
Preventive Management Strategy
Set up yellow sticky traps to monitor insect populations, and regularly spray a 10% imidacloprid solution diluted 2000 times to control the vectors of the virus. Apply calcium and magnesium fertilizers to enhance cell wall strength, and immediately destroy diseased plants and use virus A wettable powder for root protection.
Through scientific diagnosis, precise control, and ecological regulation, the occurrence of cornflower diseases and pests can be effectively controlled. It is recommended to establish a disease and pest monitoring log, combine biological and chemical control, pay attention to crop rotation, and maintain soil health to achieve sustainable cultivation of cornflowers.