Tea geometrid, also known as the arch worms, the extrados insects, scale insects, bridge-building insects, Wehrli of the Latin name Ectropis oblique hypulina.
Tea garden inchworm, many pest species are Lepidoptera geometrid moth families. The larvae surface is smooth, the abdomen is only the sixth abdominal segment and hip Festival surpassingly crawling soma a flexor stretched it out, commonly known to extrados insects, scale insects, bridge-building insects. Hi roost at the edges of the leaves, chomping leaves edge reticular semipermeable membrane spots The late larvae often chomping on the leaves into a smooth "C" shaped notch. Tea geometrid occur in the tea plantations foot crab class the most common and the most serious types of damage.
The 6-7 generations Zhejiang years old, Anhui, Jiangsu 5-6 generations pupae in the canopy topsoil wintering. March of the following year, in mid-eclosion spawning, the first generation of larvae originating in early April, the harm to the spring and. The second generation of larvae occurs in late May to early June, after about every one generation in January, 10 months after the mature larvae overwinter buried in succession pupation. Different overwintering pupae eclosion progress occurs more algebra, irregular, in addition to the first and second generation can still distinguish between overlapping generations. Duration of life of each generation is different due to the different climate. Zhejiang Hangzhou generation average temperature 18 ° C for about 56 days, 21 ℃ about 4l days of average temperature second-generation and third-generation average temperature of 26 ℃ for about 34 days, four, five generations of average temperature of 28 ° C for about 30 days the overwintering generation for up to 6 months. Adults than dusk to dawn before feathering, Bai Tianping exhibition four wings, resting in the tea leaves, and quickly flew away after frightened. Evening activities, the female fly weak, lively male fly stronger, with phototaxis.
The same day or the next day after eclosion the first part of the night mating, the day following the evening began spawning, from 8:00 to 12:00 spawning up. Egg piles produced among fallen leaves or branches and leaves of the tea tree branches crack, soil seam, soil surface, overlying white floc. General per female per day spawn once a lifetime spawning 2 to 4 times more than 2 times. Spawning more than 300 pills, more than those of more than 700 pills. Under normal circumstances, the eggs can all be output, and if spawning frightened stop spawning, intra-abdominal heritage eggs and early death. Without mating female moths also lay eggs, but you can not hatch. 2-3 days after oviposition death. The average temperature of about 10 ℃ adult life to lo days, l 9 ℃ 6 ~ 7 Tian, 24 ~ 27 ℃ for 3 to 5 days, the average temperature is higher than 27 ℃ adult reproductive disadvantage, do not lay eggs or rapid death. The eggs hatch and tidy, the hatching rate, average temperature l l ℃ eggs for 23 days, the average temperature of 20 ° C the egg stage lo days, average temperature 24 ~ 28 ℃ only 6-7 days. Newly hatched larvae through half-day cease feeding in young leaves. epidermal and mesophyll l instar larvae bite shoots only, causing the foliage into brown punctate concave spot; chomping age from young leaves edge to form a notch; 3 age increase appetite, often even the veins, petiole The food and the best 3-5 instar larvae feeding on leaf area per head average 62.6cm2. Larvae fear the sun, sunny - day and more hiding in the dorsal or tea bushes shade to uropod climbs branches, soma from branches, the shape of a black sheep, morning and evening feeding height. By alerted after silking sagging. Larval age 4 to 5, a second generation are age three generations from the age of 4,5 have three generations of the fifth instar insects accounted for 78%, 52% four generations, Five Dynasties and accounted for 42%, 6 generation accounted for 30%. Each time both before and after molting l 2 days without food fixed resting. Generations larval period in addition to the overwintering generation and the first generation of duration were generally 13 to 19 days, 30 days and 24 days. Close to the length of the duration and temperature, average temperature of 12 ° C for about 24 days, 26 ℃ for 19 days, 29 ° C for about 13 days. Silk head to the larvae mature tea bushes canopy topsoil pupation, building a soil chamber before pupation pupation after 1-2 days, buried depth is generally 1~ 2cm 2 ~ 4cm overwintering pupae. Buried many parts of the sunny side away from the foundation of 33cm within a radius of 5cm depth mostly overwintering pupae in tea tree. Pupal stage except the first, took the 13 days, 2 to 5 generations are 6 to 7 days, the overwintering pupae for up to five months or more. The geometrid influenced by the conditions of the external environment, its rampant occur commonly gap phenomenon, climate and natural enemies of its greater impact. Winter especially cold the overwintering pupae high mortality, the following year reduced insect population base, the and occurred less severe. The generally rainy climate conducive to pest re-infestation. Favorable eggs hatch in 80 to 90% relative humidity, arid climate, relative humidity less than 75% of the eggs hatch and adult emergence rate lowering. Tea gardens of the sunny sheltered sunny and warmer climate generation Ectropis Hwan occurred early and heavy. Often high plains tea garden tea garden weight. The sandy loam sticky heavy compacted soil and gravelly sand occurred. Natural enemies mainly the the tea geometrid Apanteles single white cotton Apanteles.
Recommended control methods: see the bridge-building insect control methods. |
