Mesolars are small insects with waxy secretions on their bodies. dioecism. Females are wingless, and males have 1 pair of membranous forewings, which are specialized as balance rods. Mesophyllum has a strong reproductive ability, can occur multiple generations a year, and is prone to crazy hazards in orchid gardens with high temperature and high humidity and poor ventilation. The eggs hatch into nymphs, crawl for a short time, and live in a fixed life, that is, form a shell. The resistance to drugs is strong, and it is difficult for general agents to enter the body, and it is more difficult to prevent and control. Therefore, once it occurs it is not easy to remove clean. Common species are blowing sponge borer, round shield bug, chaff patch bug, Korean ball solid oyster, mulberry white borer, Kang's mealybug and so on.
Mesosome nymphs
Adult mesozoans
First, the harm of mesozoans
Mesophyllum is the most common pest on orchids and is often found in orchid leaf beetles, petioles and leaves. Adults and nymphs use needle-shaped mouthparts to insert sap into the leaves of orchids, causing the leaves to be uneven and green, and the most serious will induce coal pollution until the whole plant dies, which is extremely harmful.
Scars left by mesozoan hazards
Second, the control of mesozoans
The mediating action of the epidermis of the mesozoan makes it difficult to completely cure with medicine, and it multiplies wildly in the high temperature, high humidity and airtight environment and seasons, and its radical treatment is quite difficult. Some people call it psoriasis in the orchid insect infestation, which is not an exaggeration.
For the prevention of mesophyllum, it is necessary to strengthen the quarantine of introduced orchids, paying special attention to the hidden places in the carapace and whether there are any leaf backs. Mesosomes are less active, slow to walk, and have limited ability to spread and spread by themselves, mainly relying on host carrier transmission. Therefore, it is very important to close the good introduction.
When the occurrence of mesenchymal insects is small, manual removal can be taken, and the nymphs on the front and back of the leaf can be gently brushed with a soft brush, and the adult mesozoans can be removed with a toothpick. At the same time, it can be combined with pruning to cut off old leaves or more harmful leaves. It is required to brush and remove the adult insects and nymphs hidden in the carapace and at the petiole, and the pruned leaves should be burned centrally, and should not be thrown on the ground, so as not to bring about the re-infection of the cultivation environment. Frequent inspection, as soon as found immediately cleared, such as generally after about 3 months can be completely removed. When the person T is cleared, the ventilation of the cultivation environment must be strengthened.
Bio-broad-spectrum insecticides
When the occurrence of mesozoans is large, you can choose to control the agent, that is, to catch the nymphs of the mesozoans and spray them. Because the nymph has not yet secreted wax on the surface of the body shortly after hatching, and the mese shell has not yet formed, it is easy to kill with medication at this time, which is the best medication period. Spray once every 7 to 10 days, 2 to 3 times continuously. Biological acaricide agents can be selected, such as 5.1% Avi methyl cyanide wettable powder or 3000 to 3500 times liquid for spraying, and the front and back of the leaves should be uniform when spraying. Orchid cultivation is generally close to human accommodation, and it is best not to use organophosphorus pesticides such as highly toxic oxidation fruit.
Protection and use of natural enemies for biological control: such as the Australian ladybird that preys on blowing sponges, the big red ladybird, the agarwood aphid wasplet that parasitizes the shield aphid, the soft aphid wasp, the red dot lip ladybird, etc. are all effective natural enemies, which can be used to control the harm of the shell worm and should be reasonably protected and utilized.
Practical experience: Prevention and treatment of mesenchymal insects is more important than treatment. First of all, it is necessary to clean and disinfect the seedlings so that there are no insects in the carapace to carry. Secondly, the ventilation of the cultivation environment should be good, and it is best to keep it in a state of breeze and gentle shaking of orchid leaves, so as not to be stuffy. Annual growth inspections should be carried out on the introduced seedlings to prevent the propagation of "leaking" mesohulls. In the prevention and treatment of drugs, the orchid frame and the site must be killed to avoid future troubles.
Author: Wan Yunkun
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