Occurrence and control of black spot of Impatiens balsamina
Black spot of Impatiens balsamina is an important disease in the production and cultivation of Impatiens balsamina. It is common and harmful in China, which should be paid attention to.
Symptoms of the disease damage leaves, especially the middle and lower parts of the old leaves are prone to infection, the damaged leaves appear round or oval disease spots, dark brown, 2Mel 10 mm in diameter, there are not obvious wheel lines, the edge is dark. In severe cases, the disease spot can expand and connect the plaque, and there are light green or olive-black mildew on the spot, that is, the conidiophores and conidia of the pathogen. It causes the diseased leaves to shrink and die.
Pathogen AlternariatenuisNees. It belongs to the subphylum of semi-knowns and Alternaria fungi. Conidiophores erect, brown, flexion, apical disease often enlarged with spore scars, size 5-125um × 3-6um. Beaked, dark brown, size 1-58.5um × 1.5-7.5 um, 1-9 transverse septum, 0-6 mediastinum.
The pathogen overwintered with mycelium on the remnant of the diseased plant and produced conidia for primary infection and re-infection when the conditions were suitable in the spring of the following year. Generally spread by airflow, like high humid environment, rainy, re-dew is conducive to the disease and epidemic. The peak period of the disease is from July to August in Northeast China, and it decreases gradually in the first and middle of September.
Prevention and cure method
The main results are as follows: (1) Agricultural control should strengthen cultivation management, fertilize and irrigate reasonably, maintain proper ventilation and improve plant disease resistance. Timely drainage after rain, removal of diseased bodies, removal of lower old leaves, diseased leaves. It is concentrated and buried or burned to reduce the amount of overwintering bacteria and improve the soil.
(2) to implement the rotation system.
(3) Chemical control is finally sprayed with 1% Bordeaux solution before the onset of the disease, and 50% carbendazim or 50% thiophanate wettable powder 800 times or 50% carbendazim 800 times can be sprayed after the attack.
Commonly used agents carbendazim, topiramine wettable powder, carbendazide.
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Impatiens brown cloud agate snail
Impatiens brown cloud agate snail scientific name AchattnafulicaFerussac, synonym A.couroupaLesson, A.fulicaTIyon, stalk eye, agate snail family, alias African snail. Originated in coastal areas of East Africa, it was introduced into Guangdong, Guangxi, Yunnan, Fujian, Hainan, Taiwan and other places in China in the 1930s. The hosts are impatiens and other flowers, vegetables and fruit trees. The damage is characterized by omnivorous pests with many young snails.
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Impatiens red diamondback moth
DeilephilaelpenorlewisilButler is the main pest of Impatiens balsamina, which is distributed in Northeast, North, East and Northwest China. The host not only has impatiens, but also has autumn orchid, grass flower and so on. The insect feeds on leaves in the form of larvae, which affects the growth and development of plants, and is the main pest of impatiens. Morphological characteristics the adult is 33-40 mm long and the wingspan is 55-70 mm. Wings and body are red
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