Prevention and control of pests and diseases in dubenju
As a representative variety of traditional famous chrysanthemum in China, Dubenju is popular among horticulture enthusiasts for its upright stems and huge corolla. However, in the actual maintenance process, pest and disease problems often trouble flower friends. This article systematically combs the common types of pests and diseases of dubenju and corresponding control plans to help you create healthy chrysanthemum plants. Identification and control of common insect pests in Dubenju are characterized by aphids infestation: they mainly gather at petals, flower buds and petioles, causing the leaves to curl and yellow. Its secretions can easily cause coal pollution disease, so special attention should be paid to the protection of heart buds.
Hazard of whiteflies: densely parasitize the back of leaves and suck juice, causing the leaves to lose luster. Its reproductive cycle only takes 7 days, and a single female can lay up to 200 eggs.
Thrips invasion: Prefer to suck on petal tissue, causing abnormal flower shape. Adults have blueshating characteristics and can be used with color plates for physical prevention and control.
Mites parasitism: It is easy to occur during high temperature periods in summer, and the characteristics of netting are obvious. Mites such as red spiders can cause yellow and white spots on leaves.
Moth larvae: Both biting and chewing hazards. The daily food intake of fifth-instar larvae can reach 200 times its body weight. Focus on preventing and controlling invasion during the flower bud period. The three-level defense system of the Duben Chrysanthemum system is constructed and implemented with the three-stage prevention and control of "prevention-monitoring-governance": soak the seedlings in warm water at 50℃ for 10 minutes before planting; check the eggs on the back of the leaf every week during the growth period; use matrine and other biological agents in the early stage of the disease. Key points of environmental control should be to keep the spacing between plants>30cm and remove deciduous weeds in time. It is recommended to use drip irrigation to maintain air humidity below 65%, which can effectively inhibit the reproduction of whiteflies. The main threat to the prevention and control of isolated chrysanthemum diseases comes from root rot, which is mostly caused by soil hardening. It is recommended to use a mixed substrate with lime soil: perlite =7:3, and apply Bacillus subtilis monthly for biological control. When rotten roots appear, the diseased tissue needs to be removed immediately, soaked in 1000 times potassium permanganate solution, and then replaced.
By establishing an early warning mechanism for pests and diseases, combined with physical control and the use of biopharmaceuticals, the stress resistance of Dubenju can be significantly improved. Regularly rotating the use of pesticides with different mechanisms of action can not only ensure the prevention and control effect, but also avoid drug resistance, so that your chrysanthemums can maintain their best viewing condition.