Studied On The Occurrence And Control Of Liriomyza In Ningxia

Liriomyza is a kind of important pest that mainly endangered the vegetables and flowers, its physique is light, form easy to obscure, it becomes harmful seriously in every spot .Of our country other province has fond out Liriomyza kinds and occurence regulation, but Ningxia still belongs to the blank.so, studies on emergence and preventing and curing is significant to the development of the agriculture of Ningxia to the spot of Ningxia. This text investigated and studied the Liriomyza in Ningxia on plant vegetable area from 2003 to 2004, mainly the following of result:1, Through investigating the kinds discerning and the occurrence rule of Liriomyza in Ningxia, the result shows as following :It has already now found 4 kinds of kinds Liriomyzas of endangering the vegetables and flowers in Ningxia: Liriomyza satiuae, Liriomyza huidobrensis, Liromyza bryoniae, Liriomyza chinensis. The Liriomyza huidobrensis is first record species.2, The biological characteristics and the growth and decline law of Liriomyza shows as following :Liriomyza chinensis takes place in the last ten days of April in onions field, rising gradually afterwards, taking place one heavily in mid-July.investigated that it is heaviest to endanger on July 29. the ovum, the larva ,pupa and development starting point temperature of the whole generation respectively are 8.5℃, 9.8℃, 10.2℃, 10.4℃ in cineraria, effective accumulated temperature 52.7, 75.8, 158.5, 262.2 d.℃ respectively. Liromyza satiuae takes place 7 generations one year in the fly on the melon leaf chrysanthemum. The development order of Liriomyza huidobrensis at the chrysanthemum, aster, cucumber, pea is cucumber >Aster > chrysanthemum> the pea, but the ascending to heaven and become immortal rate order is pea > chrysanthemum > aster > cucumber.3, The result of investigation that space distribution of Liriomyza huidobrensis on the host plant Kidney bean shows as following :According to investigation result: Liriomyza huidobrensis distribution at the plant is basically minus 2 items distribution in broad bean. The whole of distribution type is a assembling type in broad bean.4, The result of probing into the happening of mixed danger and the cure indicates as following :Ningxia investigation result shows: the quantity rotio of Liromyza satiuae, Liriomyza huidobrensis, Liromyza bryoniae is about 3:2:1, the index of mixure occurence prevent and cure is 1.5 / leaf.5, The research result of Liriomyza satiuae pupa's cold resistance shows as following :With the extension in duration and reducing of temperature, Liromyza satiuae pupa's death rate rises, the survival rate reduced, when its survival rate is at 0%, thattemperature -15 X^. Proved that Liromyza satiuae pupa's cold resistance is relatively strong in this area.6^ By researching the dangers an looses to the vegetable plum beans ,the result shows as following :Acording to the endangering area and photosynthesis index to analysis can receive the following conclusion. It is determined that the coefficient (R quare ) is: 0.98, proved that the significance is strong, regression equation is:Y=- 12.82-3.50X, +17.36X2-0.17X3 R2=0.984, F=21.093.