What are the methods for controlling pests and diseases in marigolds?
Marigold belongs to the Asteraceae family and is an annual herbaceous plant native to Mexico. The orange-yellow flowers of marigold contain abundant natural lutein, and the pigment has the characteristics of being antioxidant, highly stable, non-toxic and highly safe, and is widely used in food, cosmetics, tobacco, medicine and poultry feed. Internationally, lutein oil containing 10% lutein sells for 120,000 yuan per ton, and is known as "soft gold", with very broad development prospects.
Marigold pest and disease control methods
When controlling anthracnose, root rot and brown spot disease, combine it with insect control. Choose any one of the following methods and spray 2 to 3 times to control the spread of the disease and the harm of pests.
1. 40% Tanke wettable powder at 100 grams per mu + 1.8% abamectin insecticide at 30 to 40 grams, diluted with 50 kg of water for spraying.
2. 25% Taterling wettable powder at 100 grams per mu + broad-spectrum high-efficiency insecticide abamectin poison at 60 to 70 grams, diluted with 50 kg of water for spraying.
3. 80% Dacotech wettable powder at 100 grams per mu + high-efficiency acaricide Biandihong at 60 grams, diluted with water for spraying.
Any of the above three methods can have 75 grams of the plant growth liquid Baishizhuang or 60 grams of flowering stimulant added, diluted with water for spraying (for use during the flowering period).
Marigold pest and disease control techniques
Marigolds have relatively few pests and diseases, mainly damping-off, black spot, powdery mildew, stinging moths, scale insects and other pests and diseases. In the control process, it is necessary to adhere to the principle of giving priority to prevention, with prevention being more important than cure, and to control them at the right time. Now let us take a look at the pest and disease control techniques for marigolds!
Black spot
[Disease characteristics] Black spot mainly attacks leaves, petioles and young shoots. When the leaves first become diseased, small purple-brown to brown spots appear on the upper surface, and after expanding they are mostly round or irregular dark brown lesions.
[Control method] Spray with drugs such as carbendazim, thiophanate-methyl and daconil.
Powdery mildew
[Disease characteristics] Powdery mildew attacks tender leaves, with white powdery material appearing on both sides. Early symptoms are not obvious. After the white powdery layer appears for 3--5 days, the leaves become water-soaked, gradually lose green color and turn yellow, and when severely damaged, the leaves fall off.
[Control method] Spraying with carbendazim or triadimefon during the disease period is sufficient, but Guoguang Yingna has the best effect.
Leaf blight
[Disease characteristics] It mostly invades from leaf tips or leaf margins, initially as small yellow spots, then rapidly expands inward into irregular large lesions. In severely affected plants, the withered area of the whole leaf reaches 2/3 of the entire leaf. The diseased part becomes chlorotic and yellowed, then brown, dried and falls off.
[Control method] Integrated control should be adopted when the disease occurs, and fungicides such as carbendazim and thiophanate-methyl should be sprayed.
Stinging moth
[Damage characteristics] Mainly the larvae of the yellow stinging moth, brown-edged green stinging moth, beautiful brown stinging moth, mulberry brown stinging moth and flat stinging moth, which feed heavily on leaves in high-temperature seasons.
[Control method] Once discovered, immediately spray with 90% trichlorfon crystal at 800 times dilution, or with 2.5% fenvalerate emulsifiable concentrate at 1500 times dilution.
Marigold pest and disease control
Pest and disease control methods. When controlling anthracnose, root rot and brown spot disease, combine it with insect control. Choose any one of the following methods and spray 2 to 3 times to control the spread of the disease and the harm of pests.1. 40% Tanke wettable powder at 100 grams per mu + 1.8% abamectin insecticide at 30 to 40 grams, diluted with 50 kg of water for spraying.
2. 25% Taterling wettable powder at 100 grams per mu + broad-spectrum high-efficiency insecticide abamectin poison at 60 to 70 grams, diluted with 50 kg of water for spraying.
3. 80% Dacotech wettable powder at 100 grams per mu + high-efficiency acaricide Biandihong at 60 grams, diluted with water for spraying.
Any of the above three methods can have 75 grams of the plant growth liquid Baishizhuang or 60 grams of flowering stimulant added, diluted with water for spraying (for use during the flowering period).