What Diseases and Pests Affect Narcissus
Narcissus, with its elegant flower posture, is a common ornamental plant in gardens, but it often suffers from diseases and pests during cultivation. This article will systematically analyze the prevention and control points of the three major diseases and two types of pests of Narcissus, helping growers establish a scientific protection system.
Prevention and Control Plan for the Three Major Diseases of Narcissus
Comprehensive Control of Root Rot Disease
The typical symptom is the browning and rotting of the roots, which can lead to the withering of the entire plant. In the early stage of the disease, the roots can be disinfected by soaking in a 0.1% mercuric chloride solution for 30 minutes, and during the growing period, it is recommended to spray 79% chlorothalonil wettable powder 700 times solution every 10 days. Using a breathable matrix and maintaining soil moisture ≤65% can effectively prevent the disease.
Control of Fusarium Disease
This fungus invades through bulb wounds, causing brown sunken spots on the scales after infection. Storage should maintain an environmental temperature of 12-15°C and humidity below 75%. Before storage, bulbs should be treated by soaking in a 50% carbendazim solution 800 times. It is recommended to implement a 3-year crop rotation system with aster plants.
Management Strategy for Grey Mold Disease
It is prone to occur in humid environments, manifested as a gray mold layer on the base of the stem. It is recommended to use a matrix of black peat soil and coarse river sand mixed in a ratio of 3:1, and after planting, cover with 2cm of sterilized coarse sand. During the cold treatment stage, the temperature should be kept stable at 2-5°C for 6 weeks, combined with weekly spraying of mancozeb 500 times solution.
Measures to Deal with Narcissus Pests
Ecological Control of Aphids
In the high-incidence periods of spring and autumn, a 40% omethoate emulsion 1000 times solution can be sprayed, focusing on the back of the leaves. Biological control can introduce ladybugs, releasing 3-5 adult ladybugs per square meter can establish an ecological balance.
Systematic Control of Red Spider Mites
It is prone to outbreaks in high-temperature and dry environments. It is recommended to spray the leaf surface with water in the morning and evening to increase humidity. Chemical control uses a 20% daminozide emulsion 1500 times solution, which needs to be applied continuously for 3 times, with an interval of 5-7 days. Physical control can be achieved by using blue boards for trapping, hanging 2 boards every 10 square meters.
Establish a pest and disease control log, regularly check the health of the bulbs, and maintain ventilation and light in the planting environment. It is recommended to implement a preventive disinfection system, using potassium permanganate solution to soak containers every time they are repotted. Through comprehensive control, the health rate of Narcissus can reach 95% or more.