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[Host plant] Potatoes, tomatoes, eggplants, peppers, green onions, soybeans, and other crops.
[Disease diagnosis] Occurs in sporadic or nested fields. Cuscuta twigs the stem of the plant with a cane, spirals around, grows in the contact part with the potato plant and sticks into the stem or petiole tissue, sucks the water and nutrients of the plant, resulting in weak growth of the affected plant. The plants are short, the stems are thin, the leaves are small and yellow, and the potatoes are small and small. Severe plant stems and leaves are covered with dodder, and the whole plant does not last long until it dies.
The pathogenic dodder is Chinese dodder. Cuscuta stalks are slender, yellow, and chlorophyll-free. Their stems come into contact with the host stem and come into contact with a long suction pipe. They attach to the host's surface to absorb nutrients and moisture. Flowers small, white, styles two, capitate, sepals with ridges, ridges longitudinal, sepals appear angular, bracts with longitudinal ridges on the back, stamens and corolla dehiscence alternately, the fruit is capsule, full of corolla after mature, When it breaks, it is cracked and the seeds are round.
〔The incidence rule〕 Dodder seed matures into the soil, or mixed in the host seed and winter with organic fertilizer. Spring conditions are suitable for the next spring. The wintering dodder seeds germinate in the soil. A 6 to 10 cm long shoot (a young stem) grows in the field. The top of the seedling grows in a circular motion or shakes. Once it touches a plant that can parasite. It is wound on it. When the stem of a dodder stem grows in contact with the stem of a host plant that has been wrapped around it, and it is wedged firmly into the host plant to establish a parasitic relationship, the part of the dodder and its underground parts are immediately detached and parasitic life begins. The root sucker of the dodder is formed by the vascular sheath protruding into the interior of the host tissue and is differentiated into a conduit and a sieve tube, which are respectively connected with the conduits and screens of the host plant, thereby continuously drawing a large amount of it from the host body. The water and nutrients needed for growth and development. Cuscuta entwine one plant and one host plant in the field and continues to spread around. Dodder flowers are kept open throughout the growth period. The flowers are small in number and produce a large number of seeds. After the seeds mature, most of them fall into the soil, and the seeds are hard and resistant. The seeds can survive in the soil for 5 to 10 years.
The low-lying, wet, and plant-closed areas cause severe damage to Dodder.
〔Prevention〕
(1) Select seeds to prevent them from being mixed into the field.
(2) The plots of dodder seedlings undergo deep plowing with a depth of 20 cm or more immediately after harvest, turning the seed of the seedlings into the deep layer of the soil to prevent them from sprouting and unearthing.
(3) Manure mixed with seeds of Dodder seed must be fully fermented so that the seeds of Cuscuta chinensis lose their germination power or erosion.
(4) Mulching cultivation can significantly reduce the incidence.
(5) The cultivator and barnyardgrass should be mastered when the Cuscuta sprouts and has not yet been entangled.
(6) When sporadic dodder seedlings are first seen, they must be removed from the flowering seeds before they are completely removed and burned or buried deep outside the field. When removing, remember not to leave a broken egg.
(7) Chemical control, the most effective agent is No. 1 strain of spray Blubo, the use of the concentration required to contain no less than 30 million live spores per milliliter of water, 2 to 2.5 liters per 667 square meters. Spray after rain or in the evening and cloudy days. If a stick is used to cut off the stem before the spraying, the control effect is more obvious.
Potato Codling Control Measures
[Pathogen name] Cuscuta chinensis Lamb.