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First, the occurrence of pests Leaf spot: light occurrence. Chrysanthemum disease leaf rate of 4.5%, Dalbergia leaf rate 5.63%, rose disease leaf rate of 10%, crape myrtle leaf rate of 11%.
Wilt: Light occurs. Chrysanthemum disease leaf rate was 8.3%, diseased plant rate was 4.75%, and high 30%. The Dahlia disease strain rate is 2%.
Blight: light, local light occurs. The rate of strains of hydrangeas was 2%, and the rate of diseased chrysanthemums was 17.33%.
Anthrax: lighter, moderately moderate. The leaf rates of clove and crape myrtle were 6% and 7.5%, respectively. The leaf rates of rose and dahlia were 12% and 15.90%, respectively. The leaf rates of hydrangea and bougainvillea were as high as 15.68% and 20.17%, respectively.
Black spot: moderate occurrence. The rate of hydrangea leaves was 21.52%, and rose leaf disease rate was 15%.
Red spider: light occurs. The damage rate of red, white and yellow rose leaves was 1.1%, and 100 worms were adult.
Spodoptera litura: light occurs. The damage rate of red, white and yellow rose leaves was 0.5%, and the serious flower damage rate of 3 blind adults was 10%.
Liriomyza: Lightness occurs. Chrysanthemum leaf damage rate of 3%, Dali flower damage rate of 10%.
Hummer: Moderately. The damage rate of red, white and yellow roses was 10.5%. There were 23 adult flowers, 580 high and 1100 severe.
Second, the occurrence of the trend forecast According to Guangzhou Meteorological Observatory forecast, the city after the flood season rainfall is less than 1 ~ 2%, there may be 2 to 3 tropical cyclones during this period.
The next stage of leaf spot, blight, red spider, and Spodoptera litura are expected to occur mildly, with epidemic disease, anthrax, and spotted light fly occurring mildly. Black spot disease, moderate grubs, and local bias occur.
3. Prevention and Control Opinions (1) Remove and destroy diseased bodies in time, properly watering them during cultivation, and reduce the spread of pathogenic bacteria.
(b) should pay attention to the ventilation of greenhouse flowers, control the temperature of the greenhouse, reduce the humidity inside the greenhouse, inhibit the spread of disease.
(3) Use high-efficiency, low-toxicity and low-residue medicaments for timely control.
Leaf spot: 28% scaly net 1000-1500 times or 50% acetaminophen 1500 times spray can be used to control, spray once every 7-10 days, even spray 3 or 4 times.
Fusarium wilt: You can use 50% carbendazim 500 times solution, 30% basic copper sulfate 400 times solution or 30% hymexazol 800 times solution to irrigate the root, every 7 to 10 days, once every 2 to 3 times.
Blight: In the prevention stage or at the early stage of disease, 75% chlorothalonil wettable powder can be sprayed 600 times or 70% mancozeb WP 400 times; when the disease is severe, 60% fluorine can be sprayed. Manganese zinc 1000 times or 60% extinction grams (fluoromorpholine) WP 500 to 800 times liquid prevention.
Anthracnose: The use of 80% anthrax Fumei 1000 times or 80% Dasong M-45 WP 600 times spray control, spray every 7 to 10 days, continuous spray 2 to 3 times.
Melasma: 70% thiophanate-methyl 600-800-fold or 25% defensive 1000-fold liquid spray can be used to control, spray once every 7-10 days, continuous spray 2 or 3 times.
Red spider: can be sprayed with 73% Kodak 2000 times or 50% Nissopol 2000x.
Spodoptera litura: can be sprayed with 10% chlorfenapyr suspension 1500 times or 15% Indazole suspension 3500X.
Liriomyza sativae: can be sprayed with 1.8% of avermectin 1.8% or 1.8% of avermectin at a rate of 3000 times.
Hummer: It is possible to use 25% Ake Thai 4000 times or 10% Dorabao 2000 times liquid spray.
Predicting and controlling the main pests and diseases of flowers in Guangzhou at present
According to the survey, the current pests and diseases in our city are: leaf spot, blight, disease, anthrax, black spot, red spider, Spodoptera litura, spotted fly, and thrips.