Control methods of diseases and insect pests of marigold

Marigold belongs to Compositae, annual herb, originated in Mexico, marigold orange flowers are rich in natural lutein, pigment with antioxidant, strong stability, non-toxic, high safety and other characteristics, widely used in food, cosmetics, tobacco, medicine and poultry feed, the international price of 10% lutein oil is up to 120000 yuan per ton, known as "soft gold" reputation, the development prospect is very broad.

Control methods of diseases and insect pests of marigold

Control of charcoal blast, root rot and brown spot at the same time. Choose one of the following methods for spray control for 2 or 3 times to control the spread of the disease and insect pests.

1.40% carbon gram wettable powder 100g / mu + 1.8% avermectin insecticide 30g / mu with 50kg water spray.

2.25% carbon tetralin wettable powder 100 grams per mu + Guangpu high-efficiency insecticide Aweidu 60g 70 grams mixed with 50 kg water spray.

3.80% Dasheng wettable powder 100 g per mu + highly effective acaricide 60 g water spray.

The above three methods can arbitrarily add 75 grams of plant growth liquid Pepsi Zhuang or 60 grams of flowering hormone sprayed with water (used during flowering).

Control techniques of diseases and insect pests of marigold

Marigold has fewer diseases and insect pests, mainly standing blight, black spot, powdery mildew, stinging moth, shell insects and other diseases and insect pests. In the process of prevention and control, we should adhere to the principle of prevention first, prevention is more important than treatment, and timely prevention and control. Let's take a look at the pest control techniques of marigold.

Black spot disease

[incidence characteristics] Black spot mainly affected leaves, petioles and tender shoots. At the beginning of the disease, purple-brown to brown spots appeared on the front, and after enlargement, most of them were round or amorphous dark-brown spots.

[control methods] carbendazim, thiophanate methyl, daconine and other drugs can be sprayed.

Powdery mildew

[disease characteristics] powdery mildew invaded tender leaves, white powdery substance appeared on both sides, and the early symptoms were not obvious. five days after the appearance of 3Murray in the powdery mildew layer, the leaves showed water stains, gradually lost green and turned yellow, and caused leaves to fall off in case of severe injury.

[control methods] carbendazim and triadimefon were sprayed during the onset period, but the effect of Guoguang Inna was the best.

Leaf blight

[characteristics of the disease] most of the leaves were invaded by the tip or margin of the leaves, which were small yellow spots at first, and then rapidly expanded into irregular spots. The withered area of the seriously damaged whole leaf reached 2 × 3 of the whole leaf, chlorosis and yellowing of the diseased part, brown dry and shedding.

[prevention and treatment methods] Comprehensive prevention and treatment should be taken when the disease occurs, and fungicides such as carbendazim and methyl topiramate should be sprayed.

Spodoptera litura

[harmful characteristics] the larvae of Spodoptera litura, Plutella xylostella, Spodoptera litura, Plutella xylostella and Spodoptera litura ate a lot of leaves in high temperature season.

[control methods] as soon as it is found, it should be sprayed with 90% trichlorfon crystal 800x solution or 2.5% fenvalerate EC 1500 times solution. Pest control methods of marigold combined with pest control of charcoal blast, root rot and brown spot. Choose one of the following methods for spray control for 2 or 3 times to control the spread of the disease and insect pests.

1.40% carbon gram wettable powder 100g / mu + 1.8% avermectin insecticide 30g / mu with 50kg water spray.

2.25% carbon tetralin wettable powder 100 grams per mu + Guangpu high-efficiency insecticide Aweidu 60g 70 grams mixed with 50 kg water spray.

3.80% Dasheng wettable powder 100 g per mu + highly effective acaricide 60 g water spray.

The above three methods can arbitrarily add 75 grams of plant growth liquid Pepsi Zhuang or 60 grams of flowering hormone sprayed with water (used during flowering).