Pest Problems of Chrysanthemums
As a traditional famous flower in China, chrysanthemums often encounter various pest threats during cultivation. These pests not only affect the ornamental value of the plants but can even cause the entire plant to die in severe cases. This article will systematically analyze the characteristics of the four most common chrysanthemum pests and provide professional control solutions to help you create a healthy chrysanthemum garden.
Chrysanthemum Pest Identification and Control System
1. Comprehensive Control Plan for Chrysanthemum Aphids
This green aphid, only 2-3 mm long, secretes honeydew that induces sooty mold. Its reproductive capacity is astonishing, with a single female aphid capable of producing 5-6 nymphs per day, causing leaves to stick and curl. It is recommended to adopt a three-step control method: ① Soil treatment: Form a protective circle by applying 3% furadan granules (15g/㎡) around the root zone ② Drug combination: Spray a mixture of 40% omethoate and carbendazim (1:800) ③ Biological control: Introduce natural enemies such as ladybugs and syrphid flies to establish an ecological balance
2. Comprehensive Management Strategy for Chrysanthemum Spider Mites
This red arachnid pest forms webs on the back of leaves, causing yellow and white spots. Its optimal reproduction temperature is between 25-30°C, and the risk of outbreaks increases in dry environments. In addition to conventional spraying of 0.2% urea solution, it is recommended to: • Humidity management: Maintain air humidity above 60% to inhibit reproduction • Physical barriers: Hang yellow sticky traps (2m apart) • Drug rotation: Alternately use abamectin and螺螨酯 to prevent drug resistance
3. Three-dimensional Control System for Whiteflies
Adults are 1mm long with waxy white powder and have serious overlapping generations. It is recommended to adopt an "early prevention + night treatment" strategy: • Spray matrine (1:1000) in the morning to destroy eggs • Use dinotefuran (2000 times liquid) in the evening to accurately kill adults • Set up reflective films to deter adult oviposition
4. Precision Control Calendar for Heartworms
The larval stage of this pest lasts up to 30 days, boring into stems and causing the entire plant to wither. It is recommended to establish a control timeline: • March: Remove overwintering hosts (such as wormwood and other compositae weeds) • May-July: Spray dichlorvos (1000 times liquid) every 15 days • September: Inject stems with 20% chlorantraniliprole
Preventive Management of Chrysanthemum Pests
Establish a three-level prevention and control system of "inspection-isolation-cultivation": ① Quarantine newly introduced seedlings for 15 days ② Regularly spray potassium silicate (0.3%) on the leaf surface to enhance resistance ③ Rotate compositae crops with an interval of more than 2 years
By following the above comprehensive control solutions, the incidence of chrysanthemum pests can be reduced by more than 80%. It is recommended that flower enthusiasts keep a pest control log, record pest dynamics, and combine physical, biological, and chemical control methods to create a sustainable chrysanthemum cultivation system.