Blast disease and damping-off are the main diseases of the herbaceous flowering period. Celosia, a bunch of red, marigold, and flat-headed impatiens are highly susceptible to the disease. The two pathogens are different, and the main pathogens of damping-off disease are Pythium meliloti. The pathogen of damping-off is mainly Rhizoctonia solani, but the control methods of the two are similar. The main performance and prevention measures of the two diseases are introduced as follows:
The damping-off disease is the main disease in the seedling stage of herbaceous flower seed germination. When the seedling develops, the ground surface or the subsurface stem base becomes a water-stained lesion, then the diseased part turns brown, continues to expand around the stem, the tissue is necrotic, and the seedlings fall down. When the humidity is low, white cotton flocculent mycelium grows near the diseased plant. Blight can be affected from seedlings to planting. The base of the stem produces dark brown spots, gradually sinks, and the disease part contracts. When the disease department expands to one week around the stem, the plants stand dead and do not generally fall flat.
The prevention and control measures mainly include the following methods:
(1) Seeds soaked with 50% carbendazim wettable powder 500 times for 1 hour;
(2) The matrix used for nursery was sterilized with 95% Green Hunter No. 1 3000 times liquid;
(3) The amount of sowing should not be too large; the amount of bottom water to be poured when sowing is not enough, but it is also necessary to ensure that watering is not required before sowing; to avoid the emergence of high temperature and high humidity phenomenon in the nursery; to find the condition in time Remove the diseased seedlings and their surrounding seedlings; (4) Spray 15% of Hymexazol in 450% of the initial stage of damping off; Spray 20% of Krioptophos (Lick) in 1000 times; When the disease and blight occur simultaneously, spray 72.2% Preclosure 800 times solution plus 50% thiram 800P. Spray 2 to 3 kg per square meter.
The damping-off disease is the main disease in the seedling stage of herbaceous flower seed germination. When the seedling develops, the ground surface or the subsurface stem base becomes a water-stained lesion, then the diseased part turns brown, continues to expand around the stem, the tissue is necrotic, and the seedlings fall down. When the humidity is low, white cotton flocculent mycelium grows near the diseased plant. Blight can be affected from seedlings to planting. The base of the stem produces dark brown spots, gradually sinks, and the disease part contracts. When the disease department expands to one week around the stem, the plants stand dead and do not generally fall flat.
The prevention and control measures mainly include the following methods:
(1) Seeds soaked with 50% carbendazim wettable powder 500 times for 1 hour;
(2) The matrix used for nursery was sterilized with 95% Green Hunter No. 1 3000 times liquid;
(3) The amount of sowing should not be too large; the amount of bottom water to be poured when sowing is not enough, but it is also necessary to ensure that watering is not required before sowing; to avoid the emergence of high temperature and high humidity phenomenon in the nursery; to find the condition in time Remove the diseased seedlings and their surrounding seedlings; (4) Spray 15% of Hymexazol in 450% of the initial stage of damping off; Spray 20% of Krioptophos (Lick) in 1000 times; When the disease and blight occur simultaneously, spray 72.2% Preclosure 800 times solution plus 50% thiram 800P. Spray 2 to 3 kg per square meter.
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