| Agriphila aeneociliella is a new pest occurring in wheat in Shandong province Laizhou city and Shanxi province Jincheng city in recent years. It leads to wheat yield loss seriously, and threaten the production safety of wheat. In this paper the biological, ecological characteristics and control of Agriphila aeneociliella were systematically studied to provide some valuable information for the forecasting and integrated control. The main results were:1. Initially clear the basic biological characteristics and occurrence regularity of Agriphila aeneociliella. Agriphila aeneociliella (Lepidoptera, Pyraloidea, Crambidae, Agriphila), the larvae period have6instars. Between the wing and the leading edge of the pulse white vertical sub bands are the main characteristics of the species different from other similar species. Agriphila aeneociliella occurred one generation a year in the wheat growing areas in northern China, The main damage occurred in late march to early may, after mid-May into the summer diapause, until mid to late September to break diapause and feather, eggs produced single grain scattered on the soil surface or soil cracks, hatched larvae infestation on wheat seedlings in autumn,2,3instar larvae overwinter in the soil of wheat roots. Larvae feeding on leaves and stem base mainly wheat seedlings, causing the blade nicked or broken wheat stalk, and webs hidden in the roots of the wheat, serious damage can cause crop seedling in fault block ridge, even for the reduction of ruin. The host is mainly gramineous plants, but the damage was found only in wheat field now, not found it damage to other crops.2. Clarifies the effect of temperature on the growth and development of Agriphila aeneociliella. Clear summer diapause larvae of Agriphila aeneociliella resistance to high temperature capability and cold capacity of each instar larvae. Growth rate of Agriphila aeneociliella and temperature are closely related, in the range of13-29℃, egg and larval development duration shortened with increasing temperature, growth rate accelerated with increasing temperature, they are linear regression relationship. Larvae grow fastest in29℃, larval period of25d, unable to normal growth and development at33℃. The developmental threshold temperature of eggs and larvae were9.85℃and9.910℃, The effective temperature of eggs and larvae were148.37DD and477.95DD. Under conditions of high temperature stress, summer diapause larvae survival decreases with increasing temperature, decreased with treatment time increases,2h and4h half lethal temperature were50.03℃,48.81℃, with strong capability resistance to high temperature. In terms of hardiness, young larvae have a stronger resistance to cold than the old larvae, the supercooling points of1～3instar larvae were-22.06℃,-23.21℃and-20.12℃. Combined with field survey, preliminary think it mainly by2-3instar larvae overwintering.3. Initially revealed summer diapause types and break methods. Through laboratory and field investigation, young larvae in the different light cycles and different temperatures were entered diapause state, induction of summer diapause have little relationship with photoperiod and temperature changes, and it occurred one generation a year, preliminary judgement it is obligatory insect diapause. In the experiment of treatment with low temperature to break diapause induction, treatment under17℃65days have a of higher rate to break summer diapause, and with a shorter time, is the best way to break summer diapause.4. Discusses the chemical control techniques. Toxicity determination and field efficacy results showed, in the5kinds of common pesticides, chlorpyrifos and phoxim have a good insecticidal activity of this insects and field control effect, and have good holding effect. So chlorpyrifos and phoxim with stomach poisoning and contact action can be the best chemical to control this insect, with temperature rise at the end of march, wheat turning green is the best pesticide application period, application methods recommended spraying root irrigation. In addition, before sowing wheat, be treated with toxic soil with phoxim powder agent can also play an effective prevention effect... |
PDF Full Text Request