Sunflower sclerotium disease, also known as rotten head disease, can occur in the whole growth period(200 cell seed starting trays). It is of standing dry type and rotten disk type. At the seedling stage, the disease spot which grows about 15 cm around the stem at the base of stem grows out of white flocculent hypha when it is wet, and then withers away when it is dry(98 cell propagation trays wholesale). The disease of adult plant is mainly at the base of stem, forming depression.
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Control method rotation(32 cell plug trays supplier). Long distance rotation with non host plants such as grasses for 5 years was carried out. The sclerotia was buried 20 cm underground. When the husk turns yellow, the husk turns black and the kernel turns hard, it is the mature period, so we should harvest in time(105 cell propagation trays wholesale). The part above the ground will be kept 10 cm, and the rest will be cut off, watered and spread with rice, wheat and grass, which can survive the winter safely.
(plastic propagation trays wholesale suppliers australia)In order to improve the rural sanitation, the rotten disc type first produces water soaked spots on the back of the flower disc, and then spreads to the rotten flower disc with the spots(105 cell plug trays supplier). White and black hyphae are dense between achenes and sarcocarp(128 cell propagation trays wholesale). When the number of sclerotia is large, they are connected with each other in a network, the achenes decay and turn black, the flower disc is easy to fall off, and the achenes are not mature.
Air suction precision seeder can be used for sowing. Hybrid sunflower needs a large amount of fertilizer and cultivates in time during the germination of sclerotia(50 cell plug trays supplier). The diseased plants, branches and leaves, diseased flower plates and seeds should be completely removed or deeply buried or burned to reduce the pathogen(14 gallon nursery pots wholesale). Increase P and K fertilizer application to improve disease resistance, 2~3 times per interval for 7~10 days.(plastic propagation trays wholesale suppliers australia)
The disease spot has concentric ring pattern, white mycelium grows, and black sclerotia forms in the later stage(72 cell plant trays bulk). Chemical control was applied to the sunflower at the beginning of the plate by spraying with 500 times liquid of Sclerotium wetting powder or 1000 times the spray of 50% methylene 1000 times(15 cell propagation trays wholesale). In general, when the temperature drops significantly in late October (when the temperature is lower than 15 ℃), the film is buckled.
The sunflower moth, the sunflower moth, is the main pest of sunflower(105 cell plant trays bulk). A small part of a generation occurs in one year, and two generations also occur. The first generation of adults appears in the first and middle of July, and the peak period is in the first and middle of August. The adults take nectar from the flower plate to lay eggs(21 cell propagation trays wholesale). The 1ST-2ND instar larvae take petals, and the 3rd instar larvae eat seeds, damaging the seed kernel Larvae can damage 5-8 seeds.
(plastic propagation trays wholesale suppliers australia)Sunflower can't be continuous cropping. It should be rotated with Gramineae and other crops for more than 5 years(128 cell plant trays bulk). The depth of deep soil preparation is 25-27 cm(32 cell propagation trays wholesale). The moth resistant varieties with hard shell of seed coat are selected to fumigate 1-2 times with dichlorvos in the adult peak period from the end of July to the beginning of August, and spray 500-1000 times of dipterex solution once in the larva peak period.
It has a long picking period, big picking and small retaining, and high output(162 cell plug trays supplier). The annual output is about 5000kg per 667m2. Based on the average selling price of 4 yuan per 1kg, the annual income of 667m2 is 20000 yuan, and the economic benefit is extremely considerable(50 cell propagation trays wholesale). Therefore, we should protect the mother plant. Otherwise, the open cultivation will be carried out 20 days before the frost (October 23 or so).(plastic propagation trays wholesale suppliers australia)