Studies On Bionomics Of Jaapielly Sp. And It's Control Techniques With Mulch Film And Their Extension

Mechanism controlling to Jaapielly sp. with the mulch film is that the individuals of Jaapielly sp. are killed when larvae begin to active after over-wintering or adult come out from the soil after emerging. The life cycle of Jaapielly sp. is cut off before larvar damage the trees. Many disadvantages that were caused by traditional organic P pesticide control were got rid of in bud period. Main results are as follows:1. 6 generations of Jaapielly sp take place in a year in Ningxia area. Adults of over-wintered generation appear in middle April and deposit eggs into the young flower buds. Young larvae feed on ovary and make flower buds swelling to form gall with the insects. The first damaging top appears in mid-late June. Insect population density decrease naturally because of higher temperature in early-middle July. The second damaging top appears from late June to middle August and mainly injure the autumn flower buds. The grown larvae of last generation appear in late September and enter into soil to over-winter.2. The top of larvae entering soil appears prior to 9:00 and the number account for 77% of total larver entering soil. The number of larvae entering soil account for 23% of total during 9:00-20:00. Most of larvae are distributed in 3cm of soil. Very few larvae are discovered in lower than 9cm of soil.3. Experiments showed that more than 98% of larvae of Jaapielly sp. was killed by putting the film on the ground. The times of using insecticides to control Jaapielly sp was decreased from 11 to 5 so as to get rid of a series of side effects caused by insecticides including organic P and so on. Species of natural enemy including ladybird bettle etc. increase obviously in experiment fields. The amount of natural enemy is as twice as that in conventional control fields4. The mulch film can promote to produce more sprouts on main branches (spring 7 inch branches) of Lycium Barbarum L. in an earlier time. It was statisticsed that more than 18.9% per 666.7 m2 could be obtained. Total cost of the mulch film was less than that of traditional chemical to control the insect pests. The ratio of input : output reached 1:7.1 to 29.7 in different situation. Remarkable economic benefit was gained. 5. The breadth of film material is different for different types of cultivation. Usually it is proper that the breadth of vertical projection of Lycium Barbarum L. crown plus 15cm; thickness of film is between 0.008mm and 0.016 mm. It is better to use the thin film, agri-film, weed-film and ground-film, in spring rather than the black film.6. Irrigation can remarkably decrease the eclosion rate of Jaapielly sp before larvae enter soil. Irrigation period is one of the main factors that cause different rate of larvae coming out from soil. The amount of irrigation has no remarkable effects on both larva survior and ecolsion rate of Jaapielly sp.7. Operation regulation of mulch film control technique to Jaapielly sp. include that mulch film is covered when the over-wintered larvae begin to eclosion in early-middle April. The mulch film can be uncovered until all of adults emerge in the early May. Time order of Fertilizer, covering film and irrigation is that fertilizer is first, next covering film and last, but not least, irrigation.