The Celestial Bull is a pest that harms the trunk of citrus, and when it occurs severely, it can cause the entire tree to die, of which the Star Celestial Bull is the most serious. Recently, a fruit grower consulted us, saying that the orange tree he planted had a small hole in the root and was a worm, what should I do?
Citrus brown, also known as orange brown tianniu, orange tianniu, old wood worm, pile worm, morning glory and so on. After hatching, the larvae feed under the bark of the tree, then moth into the xylem, excreting viscose feces, attached to the orifice or fall on the branches and leaves and the ground. The xylem of the murdered tree is hollowed out, grows weakly, and eventually dies.
<h1 class="pgc-h-arrow-right" data-track="2" > [morphological characteristics of citrus brown celestial bull].</h1>
Adults are 26 to 51 mm long and dark brown. The body is covered with short grayish-yellow hairs. There is a deep longitudinal groove between the two compound eyes on the top of the head. Antennal basal tumors are raised. The dorsal plate of the forebrea is sharply protruded, and the shoulders of the elytra are raised. Mature larvae are 40 to 60 mm, milky white, flat cylindrical.
<h1 class="pgc-h-arrow-right" data-track="16" > [Harmful habits and symptoms of citrus brown cattle].</h1>
The Brown Bull completes 1 generation every 2 years. The larvae hatched before early July, became adults from early August to early October of the following year, feathered into adults from early October to early November, overwintered in the division, and went out in late April of the third year. The larvae hatched after August need to go through two winters, pupate from May to June of the third year, and the adults do not go out until August. Therefore, the overwintering insects have adults and 2-year and current larvae. Adult worms emerge from April to August, with peak periods from late April to early May. Adults are most active in the first half of the night after coming out of the cave, lurking in the tree cave during the day, and the weather is sweltering before the rain, and there is more activity out of the hole. Adults lay eggs from May to September, but mostly from May to June. Eggs are laid in cracks in the trunk, at the edge of the opening and in uneven areas of the bark, and 1 egg is laid at each place and 2 eggs are laid in individuals.
Citrus brown tianniu larvae
Adult citrus brown bull
<h1 class="pgc-h-arrow-right" data-track="17" > [control method of citrus brown tianniu].</h1>
(1) Artificial capture of adult insects, scraping of eggs and young larvae. Between May and July, the adults are in full bloom and spawn at noon on a sunny day, and the eggs and hatching larvae are scraped with a sharp knife according to the characteristics of the spawning site (the crack is slightly raised or the bark shows an infiltrative point, and there is a stream of glue at the harmful place).
(2) Medicinal killing and hook killing of frog road larvae. For branches with insect feces, insert a steel wire along the borer hole to kill the larvae, and use a degreasing cotton dipping drug to plug into the worm hole, or use a syringe to inject the drug into the worm passage. The agent can be 40% Lego emulsion 5 to 10 times liquid, or with 1/8-1/6 pieces of aluminum phosphide into the worm hole, and then seal the worm hole with wet mud.
(3) Biological control. The application of insect pathogen nematodes also has a good effect on the elimination of Tianniu larvae. In addition, conditional breeding and release of swollen leg bees, the effect on the control of Star Cow larvae is obvious.