Golden Autumn in October
Citrus is growing in late autumn
The fruit is late in expansion and coloring
Due to the late autumn slightly undercooked
It is easy to provoke citrus's number one public enemy, the wood lice
During this period, if there is no good control of psyllids
Orchards can be infected with yellow dragon disease
Huanglongbing disease is a terminal disease
Once infected, there is no cure
There are two routes of transmission of Xanthalobacter disease
One is seedling grafting and the other is wood lice
Psyllid bites for 3-4 hours to spread the poison
First, the occurrence of citrus lice
★ The number of generations in a year is related to the number of new shoots of citrus, and the length of each generation is related to temperature.
★The overwintering insect generation begins to lay eggs in late March, hatches begin in mid-to-late April, adults begin to appear in early May, nymphs appear in April to September, and autumn shoots are the peak of nymphs and adults.
★ Psyllids are mostly distributed on weak trees, which generally sprout first, providing food and spawning grounds. Of the year, autumn shoots are the most affected, followed by summer shoots, especially in the early summer shoots of May, which inevitably erupt into yellow dragon disease after being affected by poisonous citrus lice. Spring shoots are mainly affected by the overwintering generation.
★From mid-October to early November, there is often a late autumn shoot, and the wood lice will have a peak and overwinter with contemporary adults.
Second, the characteristics of citrus lice transmission of poison
★ High frequency of disease transmission: both pyllids and nymphs can transmit diseases, and 80% of individual lice can transmit yellow dragon disease bacteria to healthy trees.
★ Fast transmission of poison: 5 hours can transmit poison by eating the young leaves of diseased trees.
★ Near dispersal distance: Adults fly 7 meters high and spread with the wind.
★ Lifelong transmission of poisonous diseases: Psyllids feed on the young leaves of diseased trees to allow pathogens to enter and proliferate in insects, and then the fungus lice transmits the poisonous bacteria to healthy plants by transferring plants to suck. Once the psyllid is sick, it can pass on the poison for life.
3. Prevention and control measures for citrus lice
1. Agricultural prevention and control:
Create shelterbelts to reduce the possibility of psyllids spreading with the wind; avoid mixed planting of multiple varieties, remove russetidae and intermediate hosts around orchards; plan and unify the release of shoots to shorten the hazard period.
2. Biological prevention and control:
Release citrus lice predators. Bright-bellied glazed wasps are the obligate parasitic wasps of citrus psyllids, which can not only parasitize nymphs of all ages in citrus psyllids, but female adults can also feed on young citrus psyllid nymphs.
3. Chemical prevention and control:
Grasp the three characteristics of citrus wood lice, such as small body, limited bouncing distance, basic consistency between the spawning period and citrus shoot stage, and weak drug resistance, and carry out the control of the shoot stage. Seize the spring shoots, summer shoots, autumn shoots and other new shoots to germinate to spread the leaves to spray.
Medicinal selection: Plant dragon "Turquoise Tai" 1500 ~ 2000 times spray.
Fourth, the experience of growers
01
Location: Yongfu Luojin Town, Guilin, Guangxi
Scheme: 1500 times of Turquoise
Pilling time: August 18, 2021
Return visit: August 21, 2021
02
Location: Old Zhuangyuan, Chongzuo Jiangzhou, Guangxi
Scheme: 2000 times of Turquoise
Pilling time: April 23, 2021
Return visit: April 24, 2021
Plant Dragon "Turquoise Tai"
"Turquoise Tai" has a wide spectrum of insecticidals
Kill fruit trees, tea leaves and other miscellaneous insects
Safe and efficient, cost-effective
It is the best choice for killing insects