The causes of sugarcane common diseases and insect pests and
1.1 the sugarcane diseases
From the perspective of the degree of harm, it should be said that disease is the biggest enemy of sugarcane.once the spread of disease, drug control is very difficult, as most of the bactericide is difficult to enter the sugarcane internal organization, spraying pesticide GeXueNaoYang.
Diseases: according to relevant data shows, sugar cane main diseases: pineapple, red rot, smut, etc.
1.1.1 pineapple disease harm: pineapple disease is caused by remaining in a large number of bacteria in the soil, also have a plenty of seedlings the spread of the infection.Mainly by the seedlings into on both ends of the slit, and sends out a pineapple flavor, red seedlings slit at first, as the virus continues to permeate, internal organization is destroyed, then appear black.In severe cases, seedlings death phenomenon will occur.Even a mild infection, also can cause thin seedling development.
Origin: low temperature, high humidity for a long time, long rainy day in a row, or too dry will induce the pineapple disease.If many years of continuous cropping, rat, serious pest can also lead to frequent the pineapple disease.
1.1.2 red rot harm: 3 and pineapple disease, is caused by bacteria.Its main harm sugarcane stem and leaf midrib, early is hard to find, will be formed with vertical sugarcane stalk of internal circular patches of white, his condition deteriorated, prefrontal die into white or yellow.
Cause: if the high temperature and high humidity, planting density, excessive use of nitrogen fertilizer, is likely to cause the heavy.
1.1.3 smut harm: smut is also belong to fungal diseases.At the top of the sugarcane stalk a black pair of ears, straight or curved, slight strain growth, internodes short.
Causes: the high temperature and high humidity, sugarcane field water more, or poor fine management of sugarcane field, easy to induce smut.
1.2 the sugarcane pests
Sugarcane growth in different periods, will be affected by different pests, which poses a great threat to sugar cane production quality will be.
Categories: harm sugarcane pests is about more than 200 kinds, here focuses on several typical insect pests.Sugarcane main pests: sugarcane borers, MianYaChong sawyer, sugarcane turtle, thrips, etc.
1.2.1 sugarcane borers Sugarcane borers, commonly known as sugar cane ZuanXinChong.Common species have leaf moth of yellow moth, moth moth division of a moth, and two moth, etc.
Hazard: sugarcane borers can produce 6 ~ 7 generations within a year, and there is no obvious dormant and its harmfulness is extremely strong, of course.The pearl river delta region in late march, sugarcane borers adult began to lay eggs, to June to enter the stage.8 ~ 10 months is less, and 11 ~ 12 month increase gradually.Sugarcane early victims will form the withered heart, even grow weak, easily broken, insect injury may also cause the heavy disease invaded.
Causes: sugarcane borers can winter, if you can't keep clear of in time to the sugarcane roots, and in spite of there are large areas of sugarcane borers, MianYaChong disasters may occur.
1.2.2 MianYaChong Sugarcane MianYaChong, also called sugar powder horn aphid, wax caterpillar.Wingless, viviparous length is about 1.9 mm, ovoid, surface color changes.A total of 4 age.
Hazard: sugarcane MianYaChong, can reproduce more than 20 generations a year, in the south like to cluster on the underside of the leaves feeding and breeding, the sugarcane leaves and yellow wilting, affect the normal leaf photosynthesis, reduce the sugarcane yield and sugar.
Cause: sugarcane MianYaChong like sugarcane borers, can the winter, if you can't keep clear of in time to the sugarcane roots, and in spite of the following is likely to trigger MianYaChong disasters.
1.2.3 sugarcane turtle There are many different kinds of sugarcane turtle, sugarcane turtle with black and tan sugarcane turtle in the majority.
Hazard: black sugarcane turtle development - from larva to adult will bite to eat sugarcane roots underground part, especially easy to form the dead heart seedling in seedling stage, late harm rhizome, meet wind cane will lodging.
Causes: continuous cropping easy for sugarcane turtle and comfortable living environment, endanger the sugarcane roots.
1. Thrips Thrips belonged to thysanoptera, changeable, larvae of color have white, yellow, orange, adult is brown or black.
Harm: thrips smaller, imago and larva are like hidden in the sugarcane leaves by sucking mouthparts file broken leaves, leaf juice, the serious influence of leaf photosynthesis.Knot thrips harm serious when, tip atrophy and yellow.
Causes: sugarcane field water or lack of fertilizer could make involvement-which thrips, formation of sugar cane.
