The branches are the skeleton of citrus, in addition to providing strong support, but also the main place for nutrient transportation, you may not pay attention to it, but it is absolutely important!
However, there is such a kind of pest on the citrus, I don't know whether it is that the leaves and fruits are not delicious, or that the soil is not fun, and it is specially picked up the branches. Over time, the transmission of citrus nutrients is blocked, and the tree momentum deteriorates day by day, adversely affecting the growth and fruit of fruit trees.
A resident dry pest commonly found on citrus
<h1>longicorn</h1>
Top left (Star Celestial Bull), Top Right (Brown Celestial Bull)
Bottom left (Light Shield Green Celestial Bull), Bottom Right (White Mang Golden Bull)
The above 4 species are the most common and the most harmful, and the peak period occurs from May to August every year, and the branches are eaten in the form of larvae, but the feeding sites are slightly different.
For example, the Star Sky Bull and the White Mango Golden Bull are more grounded mainly for harming the main trunk base of the adult tree; the brown Sky Cow is not picky and can moth the main trunk and main branch; the Light Shield Green Sky Cow is small in stature and likes to run to a high place, mainly harmful branches.
Celestial bull larvae
The above is, of course, a joke, and its feeding site is actually determined by the location of the female's eggs. The hatching larvae first moth the cortex and then slowly march into the xylem, of course they arrange stomata for ventilation and excrement.
<h1>Gidinga</h1>
Upper left (Rokusei Yoshichomushi), Upper right (citrus beetle)
Bottom (Citrus Popper)
Among the gidding nails that harm citrus, the skin bugs and slippery skin worms are more famous, and they come out of the hole around May every year, and June to July is the peak of spawning.
Giding beetle larvae
Unlike the white, fat and stout Tianniu larvae, the larvae of The Gidinga are relatively dry, and some of the larvae, such as slippery worms, always go straight when eating, taking a spiraling approach, which is even more harmful.
<h1>Coffee leopard beetle moth</h1>
Image source: See watermark
Leopard beetle moth larvae
It is a kind of wood beetle moth, which is larger and more distinctive in adults, and when harmful, the larvae will moth from the branches, grow the body, and move to larger branches.
Silverfish
Including dark-winged silverfish, smooth wood beetle, tea beetle, etc., although the insect body is relatively small, but can not stand the number of ah.
In addition, the above mentioned most of the larval moths are harmful, but the silverfish are adults, larvae stationed together, large and small together, this is this "family poke"?
Symptoms of citrus after mothing
<h1>The moth-affected area is glued</h1>
Insect pests nibble on the bark, along the way to the inward protrusion, after being stimulated, citrus will naturally respond, specifically manifested in the victim part of ethylene, jasmonate, malondialdehyde (MDA) and other substances secretion increased, gum secretion increased, follow-up glue absorbs water and expands, overflowing through the wound, while excreting wood chips, feces and so on.
<h1>Above ground part</h1>
We have also said before that branches are the main places for nutrient transportation, if the twigs and new shoots are mothed? Sorry, your stalk is gone.
But don't think that the trunk is so thick, it doesn't matter if it is stationed, these pests are not good stubble, if not properly handled? Sorry, your tree is gone.
<h1>On the control of resident pests</h1>
Generally, resident dry pests mostly occur in extensive management and old gardens, so strengthening field management and improving tree potential can improve insect resistance and reduce harm.
Pay attention to the protection of the tree, on the one hand, to reduce the wound, such as the skin burst worm likes to lay eggs in the trunk cracks, wounds, on the other hand, by applying white, applying medicine, brushing the trunk cracks between May and July, etc., to reduce the risk of moths.
Hunting adult insects this part is very necessary, resident dry pests should either have armor on their bodies, can resist drug fighting, or can fly well and hide, can kill feathered adult insects in time, which is of great help to suppress the base of the insect mouth, such as artificial capture of large Coleoptera, Lepidoptera insect traps to reduce the source of insects.
Poisoning, hook killing larvae, generally moths can be seen after the damage of moth-eating pests, killed with wire hooks or sprayed with imidacloprid, thiamethorline and bromide orifice, and blocked with wet mud after application. There is also a pyrethroid insecticide insecticide that fights mosquitoes at home to spray the air vent (with wood chips) for 1 minute, which can basically kill the larvae and do not hurt the tree.
In the prevention and control of other insect pests, with cypermethrin, chlorpyrifos, etc., can kill some adults and hatching larvae, for difficult pests, you can add additives such as anatomy to increase the effect.
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