Red spiders often appear during the growth of bananas, which can easily lead to a decline in banana quality and yield, thereby reducing the yield of banana farmers. So, how should banana farmers deal with the emergence of banana red spiders? Today we will introduce in detail the harm and prevention methods of banana red spiders, hoping to help everyone!
01
Harm of red spiders
Red spiders inhabit the underside of the leaves and cause harm by the sap of the leaves by the young mites, nymphs and adult mites, mainly to harm the old leaves. In the early stage, the site of the leaf back is faded green and brown, mostly along the leaf veins or branches, which will cause the entire leaf back to turn black and brown, the leaf surface to turn yellow, and eventually the whole leaf will dry up. In the time of the red spider outbreak, the whole plant can be sealed, commonly known as the "capping".
02
Morphological characteristics of the red spider
Female adult mites are reddish brown in color with dark spots on the sides of the body; male adult mites are pink in color and narrow in size; if mites are lilac or reddish, the young mites hatch milky white and are dark green after feeding; egg, round, primary milky white, late pale brown.
03
The life habits of the red spider
Adults inhabit the leaf back and are gregarious. When the female lays eggs, a single grain is laid on the back of the leaf and the eggs are fixed with secretion to avoid loss. Unfertilized eggs develop into male mites, and fertilized eggs develop into female mites. The optimal temperature is 24-32 ° C, the optimal relative humidity is 35%-55%; drought years are easy to occur, but when the temperature reaches more than 30 ° C and the relative humidity exceeds 70%, it is not conducive to its reproduction, and the rainstorm has an inhibitory effect.
04
Control measures for red spiders
1. Strengthen the management of banana orchards: remove weeds around banana orchards, remove dead banana leaves and old leaves in time; timely and appropriate irrigation to avoid excessive drought;
2. Reasonable irrigation and fertilization to promote the robust growth of plants and enhance resistance.
3. Protection and utilization of natural enemies: there are many natural enemies of red spiders, including small-eating mite ladybirds, Chilean pasteuroids, small plants, courgine blunt mites, etc., which have a certain control effect on the red spider population;
4, drug prevention and treatment: you can choose the appropriate drug for spray prevention, the focus is on the back of the leaf, the spray must be uniform and thoughtful.
Red spider eggs are generally laid on the back of the leaf and the grooves in the branches, which is not conducive to the coverage of pesticides, so it must be careful and serious when spraying, and do not hit less and miss.