Shell insects and white silk disease should not be confused, one is insect, the other is bacteria, the use of drugs is different.
The recent hot and humid weather is the peak period for the reproduction of scale insects. Many orchid friends have found shell insects on the leaves of orchids raised by themselves. many people do not know this bug yet. they only see a large piece of white powder, and some orchid friends even think it is white silk disease and use fungicides to treat it. In fact, shell insects are a kind of pest, so using fungicides is definitely ineffective.
As for the science popularization of shell insects, Lan you can check the information by himself. Scripted work is not the farmer's strong point. I came into contact with scale insects in this season the year before last, not on orchids at that time. Because there are dozens of acres of hickory trees at home, when I accidentally inspected the woods, I found that there were large tracts of white powder on the trunk of several trees. Check carefully that there are white bugs (pictured above) climbing. So went to the plant protection station to inquire, it turned out that this is a shell bug.
Shell insects can reproduce in two ways, one is sexual reproduction, the other is parthenogenetic reproduction, that is to say, they can reproduce without males, and they can reproduce several generations a year. It does a lot of damage to plants, but it also has weaknesses.
The nymph of the scale insect is very weak, and its transmission is basically driven by the wind and people and animals, so don't worry too much about the large area infection of the scale insect. At that time, my method of treating hickory trees was to scrape all the white powder with bamboo slices, and the shell insects that fell on the ground were generally unable to climb up the tree. Then brush the tree trunk with stone sulfur mixture, and finally spray around the tree with medicine, which works very well.
The shell worm on the orchid, we can scrape the leaves clean, apply the medicine with a brush, and clean the white powder scraped off for greater safety. In addition, orchid plants are sprayed with drugs specific to shell insects (this kind of medicine is available in agricultural capital stores, and their names will not be mentioned in order to avoid suspected advertisements). After such prevention and treatment, orchids generally will not be infected with shell insects in those years.
In order to thank all of you for your support to this official account, there is nothing to repay the farmer. I specially took the charcoal fire dried white tribute chrysanthemum planted at home last year as a gift and held a fan raffle draw on the same day in 2018. The number of lottery draw is tentatively set at 80. Each winning fan will receive a chrysanthemum gift from a good photographer free of charge.
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