Dynamic Of Myzus Persicae (Sulzer) Population In Tobacco Fields In Longxian County

As the major pest in tobacco fields, Myzus persicae (Sulzer) is not only its own direct harm of tobacco, it can also spread the virus disease, affecting the normal growth of tobacco plant. Through the Longxian county tobacco field investigation and study, author found that in the year 2007 showed a single peak situation, the Aphid population reached its peak at the end of June. Without the occurrence of winged aphids from mid-July, tobacco fields entered a winged aphids and non-winged aphid co-existence state. Aphids happened from the top leave and began to spread gradually to the lower leaves. With the tobacco leaves harvested from the bottom leaves on the arduous transfer. Until the leaves of tobacco plants reduced to none, there were still non-winged Aphids there.Yellow boards result showed that the winged aphid the peak of migration in early June. Winged aphid went throughout the tobacco entire cultivation process. To mid-July, winged aphids and the non-winged aphid two types co-exist, and the winged aphid population remained at a low level. This showed that there have been tobacco fields aphid infection and multi-lateral sources to the conditions and Aphid occurred within view of the complexity of the group structure, which is in the production of tobacco aphid control on the most basic source of difficulties.After study, the occurrence of non-winged aphid basic dynamic trend showed a single peak. Non-winged aphids that at the extent of damage had nothing to do with sunlight, but had something to do with the temperature and humidity. The level of state tobacco fields horizontal and vertical distribution of tobacco plant were all gathered distribution. To the horizontal distribution, a species under the control of district distribution of gathering, but also effected by the environmental, in particular the impact of wind direction. Aphid lead to a marginal effect significantly.With the leaves of tobacco plant increasing, tobacco aphid populations focus on gradually shifting, but the overall growth point at the top and remain at 2 to 3 leaves'distance. With growing different kinds of different heights, the leaves have a few differences, tobacco aphid populations of different distribution.The top leaves of aphid with the whole of the aphids was significantly positive correlation between. The top two leaves of the aphid in a direct impact on the whole Aphid number changes. Parietal lobe from the number of aphids can judge the whole amount. Based on this, can the top two of the aphids in volume as a whole aphid estimate instructions, in order to identify and control targets, more convenient.Investigation and analysis showed that the species "9717", the strong performance of the anti-aphid capacity, "Qinyan 96" times. Breathing in Longxian, these two varieties should be used as the preferred varieties.Tobacco Seeds in the Mong the highest number of long-term medication. From time to read the medication, the medication on time 9:00-12:00 and 15:00-20:00, and respectively of the total number of drug 44.74 % and 39.47 %. Widespread use of tobacco fields in the manual sprayers, but a few farmers used the mobile sprayers. The author suggested that universal mobile sprayers, to promote the rationalization of the use of methods as soon as possible. Increase the using efficiency and optimize the use methods.