Yesterday we introduced the top killer recession disease, and today we talk about the pest:
1. The Celestial Bull is a large class, not a single insect, and the number is huge, there are more than 20,000 species in the world, but it is mainly distributed in the tropics. (And our macadamias are also importantly planted in tropical and subtropical areas, no wonder the tianniu is seriously harmful).)
2. Tianniu is a plant-eating insect, and its pests are mainly in the larval stage. Tianniu larvae can burrow into the tree to live for more than two years, because of this drilling habit, the damage of the Tianniu is light, the branch that drills in dies, and the whole plant dies. (Critical period of prevention and control).
Today is dedicated to macadamia spin-skinned celestial cows.
Brief introduction:
Dihammus cervinus Bates is a genus of Coleopters, Cerambycidae, subfamily Lamiinae. At home and abroad, it is also known as coffee allbright, rotary skin allure, fluffy cow, teak tumor hole borer, etc.
Morphological characteristics:
imago
The body length is 15-30 mm, and the whole body is densely covered with pure brown or dark brown fuzz with silk color, without other color markings; the hairs at the antennae ends are thinner and darker in color.
ovum
Prismatic, narrowly pointed at both ends, slightly curved, milky white at first birth, gradually becoming creamy yellow, and yellowish brown or tan near hatching.
larvae
The mature larvae are milky white, flattened and cylindrical, and the thoracic segment is wider and gradually shrinks towards the tail.
Pupae (pupae)
Milky white, yellowish brown or tan when feathered.
Life Habits:
In Yunnan, the spiral skin Tianniu occurs 1 generation per year. After mid-to-late October, most of the larvae have reached old age, endangering the upper and lower parts of the topsoil at the base of the trunk. When the temperature drops to 20 ~ 25 ° C, the old mature larvae are stimulated by light and light waves, under the epidermis of the base of the affected trunk or drill through the skin of the trunk and go deep into the soil, do not eat and move underground, and enter the diapause state, and the old mature larvae overwinter in a diapause state. In mid-to-late March of the following year, when the temperature rises to 20 ~ 25 ° C, and after being stimulated by light and light waves, the diapause is lifted and continues to develop. From early and mid-April to mid-to-late May, pupate is in full bloom. From late April to mid-to-late May, when the temperature rises above 30 °C, and after continuous rain or showers, especially after the stimulation of rainwater, the soil moisture is 80% to 90%, the adult insects gradually feather, drill through the bark of the base trunk or climb up to the surface of the soil, first make a short stop or short crawl, and then begin to take off. The peak spawning period for adult worms is from mid to late May to mid-to-late June. Under the conditions of room temperature 30~32°C and relative humidity of 70%~90%, the egg stage is 6~9 d, the average is 7.5 d; the larval stage is 287~298 d, the average is 292 d; the pupal stage is 12~18 d, the average is 15 d; and the completion of 1 generation is 305~325 d, with an average of 315 d.
