What pesticide to spray on begonia flowers infested with insects
Begonia flowers, as one of China's traditional famous flowers, are deeply loved by horticulture enthusiasts for their brilliant blooms and elegant tree shapes. However, during the high-incidence period of diseases and pests from April to September each year, aphids, red spiders, and other pests often cause the leaves to curl and deform, severely affecting the plant's health. Timely implementation of scientific control measures is the key to maintaining the ornamental value of begonia flowers.
Common pest types and control methods for begonia flowers
Characteristics of aphid damage and pesticide selection
Aphids congregate on tender shoots to absorb sap, causing new leaves to become malformed and curl. Spraying a 10% imidacloprid water dispersible granule at a dilution of 2000 times in the early morning, combined with the use of yellow sticky traps, can achieve better physical control. In severe cases, a 20% carbaryl emulsion can be applied at a dilution of 1500 times for foliar spraying, with two consecutive applications spaced 7 days apart.
Ecological control techniques for tussock moths
The larvae of this pest feed on leaves at night and hide in bark crevices during the day. It is recommended to use a 2.5% lambda-cyhalothrin emulsion at a dilution of 3000 times, combined with manual removal of overwintering egg masses from the trunk. Biological control can involve releasing Trichogramma spp., with 3-5 cards hung per plant.
Comprehensive control plan for red spiders
High temperatures and dry environments are prone to red spider infestations, with leaves showing yellow and white spots. It is suggested to alternate the use of a 20% fenbutatin emulsion at a dilution of 1500 times and a 15% pyridaben emulsion at a dilution of 2000 times, focusing on the undersides of leaves. Maintaining an environmental humidity of over 60% can effectively inhibit reproduction.
Key points for pest prevention and management in begonia flowers
Key environmental control measures
Ensure at least 4 hours of direct sunlight each day and regularly prune dense branches to enhance ventilation. During winter clean-up, thoroughly remove fallen leaves and disinfect the entire plant with lime sulfur solution.
Chemical pesticide precautions
Avoid using pyrethroid pesticides during high temperatures, and emulsion formulations require secondary dilution. For controlling longicorn beetle larvae, a 5% cypermethrin microcapsule formulation is recommended for trunk injection, while during the adult stage, an 8% Green Weilei suspension can be sprayed.
By establishing a plant protection system focused on prevention and comprehensive management, combined with precise pesticide selection, the occurrence of begonia flower pests can be effectively controlled. It is recommended to check the undersides of leaves and tender branches regularly each month, addressing issues promptly, and to rotate pesticides to prevent resistance.