Main diseases and insect pests of flowers in summer and their control methods

According to a recent survey, there are many kinds of diseases and pests in flowers and plants, and the main diseases and pests are whitefly, Liriomyza huidobrensis, scale insects, beetles, chrysanthemum black spot, anthrax and so on.

Whitefly

The insect occurs on many kinds of flowers, and poinsettia suffers the most. Recently, in Panyu Hualong, Zengcheng Zhenlong, Fangcun and other places, it was investigated that poinsettia, African chrysanthemum, cherry angel, green emperor, melon and leaf chrysanthemum and other varieties had a large population of insects, with an average of 268.7 live insects, including 300,403 live worms of poinsettia and African chrysanthemum. The insect state is mainly nymph, which is also the appropriate period for control. The insect has the characteristics of rapid reproduction, overlapping generations and strong drug resistance, so it is necessary to apply pesticides in the nymph stage to improve the control effect.

Liriomyza huidobrensis

This insect is the main pest of chrysanthemum, dahlia and other flowers. According to a recent survey, the average leaf injury rate is 13.6%, 28 live louver worms, and the pest index is 3.2. It is expected that the insect will occur moderately.

Scale insect

At present, the population density of loose-tailed sunflower fine-leaf banyan and cycad is relatively high, and the species of scale insects are: shield scale, cotton blowing scale, wax scale, etc., the leaf injury rate is 7.8%, 929.3 live louver insects, and some serious ones are as high as 4878.

Beetle

The insect is a polyphagous pest, the adults gnaw on leaves and petals, and the nymphs damage the roots. According to a recent survey of chrysanthemum, velvet, Lvdi, loose-tailed sunflower, etc., the leaf injury rate was 5%, and 6 live insects were found.

Black spot of chrysanthemum

Recently, the weather is quite humid, which can easily induce the occurrence and development of the disease. According to a recent survey of chrysanthemum varieties such as Lijin and Princess Anning, black spot occurred seriously, with an incidence of 27.8%, serious as high as 43%, and leaf incidence of 13.4%.

Anthrax

The disease occurs on flowers such as African chrysanthemum, chrysanthemum, Hawaiian coconut, white palm and rich coconut. The general plant incidence rate is 20.25%, the leaf incidence rate is 14.5%, and the serious one is as high as 61%.

In addition, some flowers suffered from thrips and red spiders, including 100 live heads of African chrysanthemum thrips and 60 live worms of fine-leaf banyan.

Prevention and cure method

The main results are as follows: 1. To control flower whitefly, scale insects should be used in the nymph peak period.

Whitefly: you can choose 10% Kangfudo 2000 times or 2% insecticidal urea 2000 times or 10% imidacloprid or aphid lice 1000 times spray. Spray every 7 murmurs every 10 days and spray 2 Murray 3 times in a row.

Scale insects: you can choose 1000 times liquid spray such as 40% speed culling or fast scale gram 1000-1500 times or 40% omethoate.

Liriomyza huidobrensis: 1.8% chlorhexidine or green vegetable 1000 Mel 1500 times or 40% Lesbon 800 times liquid spray.

2. To prevent and control flower diseases, start to use medicine at the seedling stage or the early stage of the disease, spray it every 7-15 days according to the condition, and spray it 3-5 times.

Chrysanthemum black spot: (1) removal of old diseased leaves and centralized burning; (2) chemical control; you can choose 500 times of 50% carbendazim or 800 times of 80% carbendazim or 25% of enemy power to remove 1500 times liquid spray.

Anthrax: you can choose 50% Shibao Gong 1000 times or 40% Shibao Le 1500 times or 75% chlorothalonil + 70% topiramate 1000 times liquid spray.