Hedgerow New Pest--Study On Rhamnomia Dubia (Hsiao)

Rhamnomia dubia (Hsiao) hazards Ligustrum sinense Lour at the hedge in Nanping badly.It can parasitize Ligustrum sinense Lour Osmanthus fragrans Lour and Ligustrum lucidum Ait.The life history has egg nymphae and imago three stage . It belongs to paurometaboly. Nymphae has five instar. The character of prothorax tergum and wing budare is the important gist of how to divide the nymphae instar. This test fist reports that the character of all instar nymphs, Biological characteristic Spatial distribution patterns Sample technique Integtated control technique.Rhamnomia dubia (Hsiao) has two genetations each year and overwinters with imago on branch. The imago begins to active in the first ten days of April. The imago begins to oviposit in the middle ten days of April. The first generation nymphae hatchs in the first ten days of May. The first generation imago emerges in the last ten days of June. The second generation egg emerges in the first ten days of July. The second generation nymphae hatchs in the last ten days of July. The second generation imago emerges in the middle ten days of Septemper.It is 2~3 days that the female imago begins to oviposit after coitus. The female imago oviposits only once lifetime, the oviposit quantity is 4~10 granule. The time of egg is 10-17 days. The hatch rate is high, more than 95%. The female and male mate for 0.5~1 day with their venters face to face. It is 7-10 days that the female imago dies after oviposit. The natural life of first generation imago is 17.6 days.In the May and June , the quantity of the pest increases when the nymphae hatchs. The scathe is serious gradually and the first scathe peak appears. From the last ten days of july to the lastten days of August, the 4-5 instar nymphs and imago of the 1st generation the 1 instar nymphae of the 2nd generation attack together, it is the 2nd scathe peak . The quantity of the 2nd generation nymphae reduces gradually after October, the quantity of species group is least of the whole year after November.The frequency distribution test shows that the distribution of Rhamnomia dubia (Hsiao) coincides with negative binomial distribution core distribution and possin binomial distribution, but it does not coincide with binomial distribution and compound possin distribution.The aggregation index test shows that the space distrubution of Rhamnomia dubia (Hsiao) coincide with aggregation distrubution, The 1~3 instar nymphae gather highly, the aggregation degree of 4-5 instar nymphae down, the aggregation degree of imago are lower.The regression model test shows that M=0. 2634+1.0575 X(r=0. 9925**), S2=6. 457 X1.1553 (r=0. 9621**), La=0. 213+ 1. 0289X(r=0. 9982) L' =1.2004+1.0504 S2 (r=0.9981), C'=0.7868 +0. 9711X (r=0. 998), M*=0. 8435 + 0. 6076 S2 (r=0. 9912) . That show thespace distrubution of Rhamnomia dubia (Hsiao) coincides withaggregation distrubution. The correlation coefficients of sixmodel are very high. It shows that the six regression model arevalidate. It shows that the space distrubution of Rhamnomiadubia (Hsiao) coincides with aggregation distrubution fromdifferent point of view.The aggregation index of Rhamnomia dubia (Hsiao) that is estimated by knife-slices estimate method shows that the space distrubution of Rhamnomia dubia (Hsiao) coincides with aggregation distrubution.It is calculated that B0 by the zero frequency method.That shows the space distrubution of Rhamnomia dubia (Hsiao) coincide with aggregation distrubution. The species group type is "zore frequency dependent" .The aggregation causation is tested by the Bliackithspecies group aggregation average number( ). x =mr/2k=3.5285 >2. It shows the aggregation of Rhamnomia dubia (Hsiao) is caused by the insect behaviour or the insect behaviour and environment inhomogeneity effect each other.The general current of M*/X time series change shows high- low - high - low - high. That mearns the change current of Rhamnomia dubia (Hsiao) species group is aggregation -diffusion- aggregation -diffusion -aggreg...