The symptoms are also known as pink boll pink. To harm the bolls, the sick bells are covered with pink velvet, thick and tight. When the climate is humid, it becomes white fluffy material, which is the conidiophore and conidia of pathogenic bacteria. Causes the bolls to fail to crack, and the fibres stick into a deadlock.
The pathogen Trichothecium roseum (Pull.) Link [Trichoderma roseum Pers., Cephalothecium roseum Corda] is called a pink fungus, a fungus belonging to the subphylum Fungi. The colony was white at the beginning and it turned pink. The conidiophore stalk is colorless, erect, slightly curved at the top 84.8-198.42.56-3.84 (μm) in size, and has a connate spore on its distal side. The conidia are ovoid, and the sporangia have a papillary protrusion, size 12-208-10 (μm), forming a spore chain toward the base sequence.
Transmission routes and disease conditions Pink powder may overwinter on sick bells. The bacterium is a weak parasite that invades the cracks in the wound or bell shell and re-infects it with wind, rain, water, and insects. Low temperature and high humidity facilitate disease. Heavy storms or pests cause severe disease. Soil viscosity, poor drainage, planting density, pruning is not timely, the application of excessive nitrogen fertilizer in the cotton field is heavy.
Control methods (1) Shi Shiji, suitable for Miao Fei, reapply bud fertilizer, Hua Fei. Increase phosphorus and potassium fertilizers to prevent leggy and enhance plant resistance to disease. (2) Clean the garden and reduce the source of bacteria. Illness bells were removed in time. (3) Proper close planting, timely pruning, and timely drainage after rain to prevent moisture retention and reduce the incidence. (4) Prevent boll pests in time, especially bollworm pests such as cotton bollworms. (5) At the beginning of the drug control spraying 36% thiophanate-methyl suspension or 50% carbendazim wettable powder 1000 times, 1:1:200-fold Bordeaux mixture, 75% chlorothalonil wettable powder 700- 800 times liquid, 40% epidemic epilepsy (deuterium phosphorus aluminum) WP 300 times, 41.6% Baolingfeng 300 times, every 667m2 spray good liquid 100L, spray 10 days, even spray 2-3 Times.
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