During the cultivation process, flowers are affected by a variety of pests and diseases, affecting the normal growth and ornamental value of flowers. The main pests that occur frequently in flowers are: whitefly, scale insect, anthracnose, chrysanthemum black spot, aphid and so on. Promptly carry out pesticide control to make flowers grow normally.
According to the investigation, the disease is caused by flowers such as coconut, chrysanthemum, white palm and dahlia in Hawaii. The chrysanthemum is the most seriously damaged. The incidence rate of common plants is 7-40%, and the serious rate is as high as 92.9%. 29.9%. The incidence rates of chrysanthemum, dahlia, and hawaiian coconut were 35%, 7%, and 27.3%, respectively. In the case of high temperature, improper fertilization, and phytotoxicity, the disease was easily induced.
There are many types of scale insects in the flowers of the city, including shield mites, cotton aphids and wax mites. Recently, the investigation of the leaves of the sunflower, the fine leafhopper, the cycads, etc., the leaf damage rate is 6.7%, 60 worms, of which 70% of the nymphs. It is expected that the insect will occur moderately from August to September.
The mites are harmful to a variety of flower species, especially Poinsettia. Recently, poinsettia, cherubs, leaf peony, cineraria and other flower varieties have been investigated. Generally, 19 to 193 live worms, and each of the severe leaves has more than 200 heads. The insect has the characteristics of rapid reproduction, overlapping generations, and high drug resistance. If the prevention and treatment is weak, it will rapidly expand into harm. In severe cases, the damaged leaves cause the leaves of the affected plants to curl, green and yellow, and even dry. The future high temperature and dry weather is very favorable for the occurrence and reproduction of whiteflies. It is expected that the insects will be moderately heavy in August-September.
Chrysanthemum black spot disease in the recent thousand and one wet weather, it is easy to induce the occurrence and development of the disease. Recently, the chrysanthemum varieties such as Li Jin and Princess Anning have been investigated, and black spot disease has occurred more seriously. According to the pesticide network , chrysanthemums with the highest growth period and high planting density are the most seriously affected. The incidence rate of the strain is 30-80%, the severity is as high as 100%, and the leaf incidence rate is 56.8%, including 44% in the seedling stage and 61.4% in the middle seedling stage. According to the municipal meteorological department, the rainwater in August is more than 1-2%. And there are 5 times in a rainstorm precipitation process. It is beneficial to the occurrence and development of diseases. It is expected that the above two diseases will be more serious in August-September.
In addition, locust damage occurred in some places, the damage rate of small angel leaves was 17%, and the number of live worms was 1,105, of which 99.4% were nymphs, which was also a key period of prevention and control. It is expected that aphids will occur on some flowers.
Prevention and Control Opinions In order to ensure the normal growth of flowers, all localities should do a good job in pest control according to local conditions.
1. Prevention and control of flower whitefly and mites should catch the nymphs during the peak period.
Beetle: You can use 40% speed slash or 40% speed 1000 1000-1500 times or 40% omethoate 1000 times liquid spray.
Whitefly, aphid: can be sprayed with 10% Kangfudu 1500-2000 times or 2% diflubenzuron 2000 times or 10% imidacloprid or 3% dilute 1000 times liquid spray, spray every 7-10 days, even spray 2 to 3 times.
2, prevention and control of flower diseases, starting in the seedling stage or early onset of the disease, spraying once every 10-15 days, continuous spraying 4-5 times.
Chrysanthemum black spot: 1) After flowering, cut off the aboveground part and concentrate on burning the diseased plant; 2) Remove the diseased leaves at the beginning of the disease; 3) Use 50% carbendazim 500 times or 80% captan 800 times or 25% The enemy forces off 1000-1500 times liquid prevention.
Anthrax: China's pesticide network recommends using 50% Shibaogong 1000 times or 40% Shibaole 1500 times or 75% chlorothalonil + 70% thiophanate 1000 times liquid spray.
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