Growing citrus, red spiders have always been an inescapable problem, and red spiders can seriously affect citrus production.
The citrus red spider, also known as the citrus full-claw mite, is a pest that sucks the juice of leaves, young branches, young fruits and flower buds, causing harm. Red spiders cause the affected parts to fade green first, then appear gray-white spots, causing the leaves to lose their luster, and causing leaves, flowers, fruits, and finally young branches to die.
(1) Eggs
The eggs are spherical and bright red at first.
(2) Juvenile mites
The body color is mostly reddish or yellow, and there are three pairs of feet, of which 2 pairs are in the anterior half and 1 pair is in the posterior half.
(3) Mites
The body is oval, raised on the back, hemispherical on the sides, purple-red in color, with red protrusions on the back, and four pairs of feet. Male adult mites are smaller than female mites , have diamond-shaped abdomens , orange-red or brownish red , and have slightly longer feet than female mites.
Eggs and adult mites overwinter on the branches and leaf backs, and occur 15 to 18 generations a year in the south.
(1) Agricultural prevention and control: strengthen water and fertilizer management, increase field humidity, such as increasing irrigation. It is also possible to change the microclimate and biological composition by planting thistles and the like.
(2) Biological control: through the protection and use of natural enemy insects, such as tower six point thrips, deep point mite eating ladybird, etc.
(3) Chemical control: in the period of harm, we should pay attention to the prevention and control of pharmaceuticals. If it is only a localized hazard, to reduce the number of sprays in the whole park, local treatment can be done. When there are an average of 100 leaves with 1 to 2 head worms, a comprehensive spray control is carried out.
It can be used with 43% biphenylhydrazine fat 3000 times + 15% ethoazole 3000 times, 43% biphenylhydrazine fat 3000 times + 240/g spironite 2000 times, 5% avermectin + 5% azole ester 1500 times.
Tips: The generation of red spiders is seriously replaced, and it can be replaced by 15 to 18 generations in a year in the south, so we must pay attention to the combination of insecticide and egg killing in order to achieve better control effects. And it is not possible to use a single drug, minimize the number of medications, and use each acaricide no more than twice a year.
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