The diseases of banana zucchini are mainly virus diseases, gray mold, powdery mildew, etc.; physiological diseases are mainly melting melon; insect pests are mainly aphids, whiteflies, etc., and the control methods are as follows.
Viral disease
Viral disease caused by cucumber mosaic virus, watermelon mosaic virus and several other viruses alone or compound infection. Leaves and the whole plant, the leaves show green shades of blossom, plant dwarfing, heart leaves crumpled, leaves become small clusters; diseased melon epidermis produces blossom verruca-like protrusions, the whole melon deformation; some of the leaves are particularly small. Mainly through the seed, aphid contact transmission, dry years, aphids, seeds with poisonous conditions susceptible to disease. Prevention and control of virus disease can be used 10% trisodium phosphate solution to soak the seeds for 20 minutes, timely treatment of aphids, the onset of the early spray 20% virus A wettable powder 500 times liquid, or 1.5% phytophthora emulsion 800 times liquid spray, 7 to 10 days spray 1 time, used 2 to 3 times.
Gray mold
is a fungal disease caused by hemiptera subphylum gray staphylosporidium, mainly affecting flowers, young melons, leaves and stems, more from the withered female flowers invasion, so that the petals of the petal rot, and then the development of young melons; the initial umbilical cord water stained, followed by soft rot shriveled up, high humidity on the formation of flowers and young melons on the dense layer of gray mold. Pathogens mainly mycelium, conidia in the residue, soil surface overwintering, through the airflow, dew, watering or agricultural operations spread diffusion, in the air humidity is susceptible to disease. Prevention and control of gray mold can be used 50% speed Kelvin wettable powder 600 times liquid, or 65% of the A mycophenolic 400 times liquid spray control, 3 ~ 4 days to spray 1 time, 3 ~ 4 times.
Powdery mildew
is a fungal disease caused by the sac fungus monofilamentous powdery mildew. It mainly affects the leaves, and the leaf surface is like a layer of white powder, and finally the diseased tissue is brown and necrotic. Pathogen spread by airflow and rain; indoor 10 ~ 25 ℃ can be onset, high temperature, dry and humid alternation is conducive to the onset. Prevention and control of gray mold in the early stage of the disease can be used 20% powder rust Ning emulsion 2000 times, or 2% antimycobacterial mycotoxin (agro-anti-120) water 200 times spray control, 3 ~ 4 days to spray 1 time, used 3 ~ 4 times.
Gourd
Gourd refers to the banana zucchini female flowers open 3 to 4 days after the apex of the young fruit faded green and yellow, thin and soft, the fruit does not expand or expand very little, the surface loses its luster, the apex of the shriveling, can not form a commercial gourd, and ultimately rotted or shedding of the phenomenon. It is mainly caused by environmental conditions or nutrient supply disorders. Prevention and control of melons is mainly through the adoption of measures such as cultivating strong seedlings, increasing the application of organic fertilizers, reasonable thinning, carbon dioxide fertilization, hormone treatment and other measures.
Aphids
Homoptera Aphididae pests. To adult aphids and aphids cluster on the back of melon leaves and young stems to suck sap, so that the cells are damaged, the growth is out of balance, the leaves to the back of the curled crumpled, when the plant stops growing, or even the whole plant wilted. Aphids discharge a lot of water and honeydew when infested, dripping on the leaves, causing mold infection. Prevention and control of aphids can be used silver gray film to avoid aphids, yellow board baiting, but also can be used 10% wettable powder 2000-3000 times liquid, or 2.5% deltamethrin emulsion 2000-3000 times liquid spray control.
Whitefly
Homoptera whitefly pest. Mainly adults, worms concentrated on the back of young leaves sucking sap, causing leaves discoloration, yellowing, wilting, and in severe cases, the plant withered and died. Adults are 1 to 1.4 millimeters long, yellowish, and their wings are covered with white wax powder. Overwintering in the greenhouse in a variety of insect states, mainly by seedling planting and ventilation when the adults fly to spread, alternating between greenhouse and open field pests. Prevention and control of whiteflies can be used yellow board baiting, 1.8% zithromax emulsion 3000 to 4000 times liquid, or 10% pesticide emulsion 1000 times liquid spray control, due to the whitefly is easy to migrate, spraying should be carried out in the evening.