The planting area of camellia oleifera has increased year by year, but some camellia oleifera forests are not well managed, and the occurrence and harm of camellia oleifera diseases and insect pests are becoming increasingly serious. Camellia oleifera blue-winged tianniu (black tarsal eye tianniu) occurs in various oil tea producing areas, and tea brown tianniu, oil tea red-winged tianniu, xingtianniu and other tianniu occur in some areas. The main harm of the celestial bull is that the larvae will moth the branches, destroy the transport and conduction of nutrients and water, resulting in the decline of tree growth and serious death of camellia oleifera trees. The following focuses on the occurrence characteristics and prevention and control measures of oil tea Tianniu, for reference only.
Oil tea Tianniu hazard symptoms
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The blue-winged Tianniu 1-2 years old generation, all of which overwinter in the trunk of the infested camellia oleifera tree, the overwintering old mature larvae pupate around April, feather long eggs in May-June, adults will eat the young branches and leaves, lay eggs on the main trunk of the camellia oleifera tree, will first use the upper jaw to bite the bark into a "mountain" shaped egg laying scar, and then lay eggs under the cortex in the scar. The hatching larvae bite into a small circle on the branches, then moth into the inside of the branches and feed the adults upwards, where fresh wood chips can be seen outside the borer holes. The tissue in the victim area swells into nodular knots due to stimulation, and the branches and leaves above the nodules first fade green and yellow and then die, which is easy to break.
Tea (brown) tianniu is more harmful to old camellia oleifera trees, generally also 1-2 years occurrence of 1 generation, adults mostly lay eggs under the bark near the ground at the base of the trunk, the larvae hatch under the trunk bark soon after the moth into the xylem, first eat upwards and then turn downward moth to the root, there is a large number of sawdust powder yellow excrement at the mouth of the moth. After the main trunk and roots of the camellia oleifera tree are damaged, the affected tree grows poorly and gradually dies.
It is worth noting that the larval ox concealment is relatively strong, the larvae moth feeding the initial plant performance is not obvious, not easy to detect, if the trunk is found that there is powder on the trunk is actually too late, indicating that the larvae have been burrowing into the moth for a long time. Be sure to find out early, just see a little wood chips must be quickly and timely.
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The key to the prevention and control of Camellia oleifera tianniu is prevention-oriented, do not let adult insects lay eggs on the tree, weed and cut off the insect branches in time, reduce the source of insects, and promote the robust growth of camellia oleifera trees. Brushing the trunk of the tree with lime in winter can prevent adult insects from laying eggs on the tree, which can achieve the effect of doubling the results with half the effort.
Tree trunk injection to control larvae: if wood chips are found, you can use wormholes such as wire to make them larger, and stuffing the insecticidal cotton into them can smoke the larvae to death. Artificial tree hole insecticide can be soaked in 80% of the dichlorvos or cypermethrin, meypermethrin and other pesticides, put it into the tree hole and then seal the tree hole with mud, you can kill the larvae.
8% Green Vere (Cypermethrin)
Control of adult insects: In the adult feathering stage, spray with 8% green Weere 200-300 times liquid, sprayed on the trunks, branches and other places where tianniu like to appear above the ground, and the control of adult tianniu is very effective. Green Vere is a puncture microcapsule suspension that lasts more than 50 days and is environmentally friendly. Suitable for large area use, it can be sprayed by drone.
Biological control: The occurrence of tianniu can be controlled by releasing white zombie powder cannons or spraying bacillus thuringiensis in the forest, releasing swollen leg bees or ocular tianniu flat fly.
Finally, Tianniu not only harms camellia oleifera trees, but also citrus, peach trees, pear trees, apple trees, poplar trees, chestnuts, loquat trees, willow trees, purple weeds, elms, etc. are also their harmful objects, and attention should be paid to early detection and early prevention.
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