What are the common pests and diseases of daylily?

Daylily is both a vegetable and a medicinal herb. It is grown over a fairly wide area in China and is highly adaptable, making it a relatively easy variety to grow. Of course, everyday pests and diseases are still unavoidable issues for daylily. Below, Qinong Web will introduce some common diseases of daylily.

1. Daylily aphid

This is a pest with a whitish color, and it is fairly easy to spot once it appears. In the early stage, 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 are covered, causing the flowers to wither and fade. A 3000-fold dilution of 50% pirimicarb wettable powder can provide some control.

2. Root rot

This is a disease mostly caused by a hot and humid environment. It concentrates on the roots and can easily kill the entire plant. In the early stage, the leaves tend to develop poorly, with new leaves small and old leaves turning yellow, while the roots darken and turn black, and finally rot. Diseased and dead plants must be removed immediately, and a 500-fold dilution of 70% thiophanate-methyl should be sprayed. It must be applied by irrigating the roots, and nearby plants also need it to achieve the ideal control effect.

3. Daylily anthracnose

The greatest threat from this disease is to the leaves. It is caused by the pathogen's spores attaching to the plant as insects move around, 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 areas, black rot and perforation occur. After discovering the disease, a 1000-fold dilution of 70% thiophanate-methyl can be used for control. After recovery, it is best to spray 1-3 more times at one-week intervals to prevent recurrence.

4. Rust

This is also one of the more serious diseases affecting daylily. It mostly concentrates on the stems, is highly contagious, and occurs around the time of flower bud formation. When it appears, 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 a 1000-fold dilution of 25% triadimefon WP, and once found, 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 cultivation, so it is recommended to choose varieties with better resistance when selecting them early on. To learn more related information, you can continue to follow our website.