Latest Roundup of Common Pests and Diseases of Daylily

Daylily is both a vegetable and a medicinal herb. It is grown fairly widely in China, is highly adaptable itself, and is a relatively easy variety to grow. Of course, everyday pests are still unavoidable issues with daylily. Below, Qinnong Web introduces some common diseases of daylily.

1. Daylily aphid

This is a pest with a somewhat whitish color, and once it appears it is fairly easy to spot. In the early stages it mostly gathers on the underside of daylily leaves, and in large numbers. When the leaves can no longer meet its nutritional needs, it spreads out, and flower buds are its main target for expansion. In severe cases, the entire flower buds and leaves become covered, causing the flowers to wither and drop. 50% pirimicarb wettable powder at 3000 times dilution can provide a certain degree of control.

2. Root rot

This is a disease mostly caused by a hot and humid environment. It is concentrated at the roots and can easily cause the entire plant to die. In the early stage of the disease, the leaves tend to develop poorly, with new leaves small and thin and old leaves turning yellow. The roots darken and turn black, and finally rot. Diseased and dead plants must be transplanted immediately, and 70% thiophanate-methyl at 500 times dilution should be sprayed; it must be irrigated from the roots, and nearby plants all need it as well, to achieve the ideal control effect.

3. Daylily anthracnose

The leaves are what this disease threatens most. The cause is that the spores of the pathogen attach to the plant as insects move about, and it is most likely to appear in warm and humid conditions. First, some brown spots appear on the leaf edges, and over time they extend inward; in severe spots, black rot and perforation occur. After detection, 70% thiophanate at 1000 times dilution can be used for control. After the disease is cured, it is best to spray 1-3 more times at one-week intervals to prevent recurrence.

4. Rust

This is also one that has a fairly serious impact on daylily. It is mostly concentrated on the stems, is extremely contagious, and occurs around the time of flower bud formation. When it strikes, irregular rust-colored spots first appear on the plant, then slowly spread and merge together; in severe cases the whole plant looks as if it has rusted. A relatively effective control agent is 25% triadimefon WP at 1000 times dilution; after detection, it is best to spray all plants.

The above are the common pests and diseases of daylily and some simple control methods. Disease is always a major problem in vegetable growing, so it is recommended that when choosing varieties early on, you pick ones with better resistance. To learn more related information, you can keep following our website.