In the process of cultivation, flowers are vulnerable to many kinds of pests, affecting the normal growth and ornamental value of flowers. According to the survey, the major pests that have recently occurred are: whiteflies, scale insects, anthrax, chrysanthemum black spot, and roundworms. The recent weather is conducive to the occurrence and development of these pests, and it is expected that the above-mentioned diseases and insects will be moderate to overweight.
Fenfen
The worm is responsible for a variety of flower species, especially the most serious victims of poinsettia. In recent investigations of flower varieties such as poinsettia, cherubs, leaf peony, and cineraria, generally 19 to 193 vegetative live insects, with each individual having as many as 200 heads per leaf. The worm has the characteristics of rapid propagation, overlap of generations, and high resistance to drugs. If it is poorly controlled, it will rapidly spread its damage. In severe cases, the victim suffers from leaf curling, greenish yellowing, and even dryness. The future high-temperature dry weather is extremely beneficial to the occurrence and reproduction of whiteflies. It is expected that the insects will be moderately heavy during August-September.
Coccinella
There are many species of insects in the city, including shield locusts, cotton aphids, and wax aphids. In recent surveys, the leaf avulsion rate was 6.7% and the incidence of leaf larvae was 6.7%, of which nymphs accounted for 70%. It is expected that the insects will be moderate in August-September.
anthrax
According to the survey, the disease was harmed on Hawaiian coconuts, chrysanthemums, white palms, dahlias, and other flowers, especially chrysanthemums. The incidence rate of general strains was 7-14%, and severely as high as 92.9%, and the incidence of leaf was 29.9%. Among them, the incidences of leaves of chrysanthemum, dahlia and hawaiian coconut were 35%, 7% and 27.3%, respectively. The disease was easily induced under high temperature, improper fertilization, and phytotoxicity.
Chrysanthemum black spot
The recent 11,000 wet weather can easily induce the occurrence and development of the disease. In recent investigations such as Lijin and Anning princesses, the occurrence of black spot disease was heavier. In particular, chrysanthemums in the middle growth period and planting density are the most affected. The incidence rate of the strain reaches 30-80%, and the severity is as high as 100%. The incidence of the leaf is 56.8%, of which the seedling period is 44% and the middle seedling period is 61.4%. According to the forecast of the city meteorological department, the rainfall in August is 1-2% higher. , and there were 5 heavy rains during the precipitation process. It is beneficial to the occurrence and development of diseases. It is expected that the above two diseases will occur more seriously during August-September.
In addition, locust infestation occurred in some places. The damage rate of chervil leaves was 17% and that of vegetative live insects was 1,105. Among them, nymphs accounted for 99.4%. It is also a key period for prevention and control. It is expected that locusts will occur on some flowers.
Prevention advice
In order to ensure the normal growth of flowers, all localities should do a good job of pest control work according to local conditions.
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