How to control pests and diseases on evening primrose? Latest technical methods tutorial

Evening primrose, also known as sundrop, mountain sesame, and wild sesame, is a plant in the family Onagraceae, under the genus Oenothera. It is highly adaptable, tolerant of acid and drought, and not demanding about soil; it can grow in generally neutral, slightly alkaline or slightly acidic soil that is well drained and loose. If the soil is too wet, the roots are prone to disease. In the north it is an annual plant, and south of the Huaihe River it is a biennial plant. It is the most important nutritional medicine discovered this century. It can treat many diseases, regulate lipid substances in the blood, and has a marked therapeutic effect on coronary artery infarction, atherosclerosis, and cerebral thrombosis caused by high cholesterol and high blood lipids. Its flower language is silent love and an unruly heart.

Evening primrose leaf spot

This disease mainly damages the leaves. After infection, the spots on the leaves are round, light brown, 2 to 3 mm in diameter, with a purplish red edge and a brown center, densely covered with small black dots. When the disease is severe, it can cause the leaves to wither and die. The pathogen is Septoria oenotherae Westd., belonging to the subphylum Deuteromycotina, genus Septoria, a fungus. The pathogen overwinters in diseased residues as pycnidia and mycelium. In the following spring, after the pycnidia absorb water, they release conidia for primary infection. Field spread of the disease mainly relies on raindrop splash and airflow, and seed-borne bacteria cause long-distance spread. High temperature and high humidity, and continuous rainy weather, favor the disease. Poor cultivation management and weak plant growth make plants susceptible to the disease. The hot and rainy season from July to August is the peak period of the disease.

Control methods: 1. In autumn, thoroughly remove diseased and residual leaves from the field, burn them in a centralized manner or bury them deeply, so as to reduce the amount of overwintering inoculum in the field. 2. Before sowing, soak the seeds in a 500-fold solution of 50% carbendazim or 50% mancozeb for 30 minutes, then dry them before sowing. 3. In the early stage of the disease, spray once with agents such as a 500-fold solution of 50% mancozeb or a 600-fold solution of 50% wanmeiling, with an interval of 10 to 15 days.

Evening primrose rot

The roots of diseased plants gradually change color and rot, the leaves wilt and dry up, until the whole plant dies. For control, you can use 1% lime water, or a 1500-fold solution of 50% thiophanate, or drench with a 1000-fold solution of 75% chlorothalonil.

Copper green chafer

In its larval stage, this pest damages seedlings; in the adult stage during the flowering period, it damages petals. Control methods: 1. Manual capture and killing. 2. Mix stir-fried fragrant wheat bran with a 30-fold solution of 90% trichlorfon crystals to make poisoned bait for trapping and killing. 3. Mix the bait directly with 50% phoxim emulsifiable concentrate at 1:1 and stir evenly to trap and kill.

Sooty mold and ring rot

Spray with a 500-fold solution of 50% thiophanate-methyl wettable powder.

Damage by aphids, scale insects, and whiteflies

For control, you can use a 1000-fold solution of 50% fenitrothion emulsifiable concentrate, Tianshengxing, cypermethrin, and KuaiShaling, among others, with good results.

Mites and scale insects

For mites, you can use an 800-fold solution of Kangman 23 emulsifiable concentrate, a 2000-fold solution of 73% propargite, and so on. For controlling scale insects, you can use a 600 to 800-fold solution of 40% dimethoate emulsion.

Controlling Fusarium wilt

You can spray with a 600 to 800-fold solution of Kuwei Like, a 600-fold solution of 50% carbendazim, and so on. If wilted diseased plants are found, they should be removed promptly and taken outside the garden to be burned. The soil around the diseased plants should also be turned over and quicklime spread on it, and replanting should be done after 1 month.