The Effects Of Pseudorobitis Gibbus On The Florescence Of Lagerstroemia Indica And Selection Behavior Of P.Gibbus. For L.Indica Flower Colors And Its Prediction And Forecast

Pseudorobitis gibbus feed on the tender bud and flower of Lagerstroemia indica,which can cause serious harm.In this paper,we studied the effects of P.gibbus on the florescence of L.indica,selection behavior of P.gibbuson L.indica flower color and prediction.Through the outdoor investigation and indoor biochromatography mass spectrometry,we clarified the effection on the flowering and different colors of P.gibbus choice behavior.In addition,we also summarized the period like P.gibbus prediction method,phenological prediction method and the effective temperature forecasting method occurrence period forecasting method.The results are as follows:1 Pseudorobitis gibbus effects on florescence results show: with increasing population density of P.gibbus,Lagerstroemia indica florescence shortened.The population density is less than 10 per plant has no effect on the florescence of L.indica;more than 20 head per plant affected significantly;from 20 to 40 per plant strains among different treatments have significant difference,and increased 10 P.gibbus per plant,whole plant florescence L.indica is reduced by about 25 days;The population density of more than 40 individuals per plant can make the whole plant florescence L.indica shortened to normal florescence of 1/4 or above;40 per plant and 50 per plant among treatments had not significant difference.The florescence time of L.indica population was significantly higher than that of the whole plant florescence period when the density of insect P.gibbus was less than 30 per plant,and when the density of insect P.gibbus was more than 40 per plant was similar to the whole florescence period,which was about 1/5.There are insects in the experimental group Lagerstroemia period of single flower had significant difference compared with the control group,each flower 1 P.gibbus can shorten the period of single flower 1/3,2 per plant make the period of single flower cut in half,the population density is less than 1/2 two a treatment period of single flower but no difference.There was significant difference and the higher population density was the period of single flower.At the end of the beginning full florescence Lagerstroemia indica start time in low Pseudorobitis gibbus insect density(florescence 30 per plant,Morimatsu florescence 20 per plant)are affected by the insect density difference is not significant,in the high density ofinsect p.gibbus(florescence 40 per plant,Morimatsu florescence 30 per plant)have a significant difference.Under the condition of high insect density,the beginning time of the beginning of L.indica was delayed by at least 34 d,and the florescence period could be delayed by 1 months,and at the beginning of the last florescence period was earlier at least23 d.The greater the density of the insect mouth,the later the arrival time of the florescence of L.indica,and the earlier the florescence stage,which led to the decrease of the duration of the florescence period.2 Through the investigation of Pseudorobitis gibbus damage behavior to different colors of L.indica: P.gibbus damage on taxis of different colors of L.indica deep purple>red>purple>pink> white.Independent sample T test,and the damage rate of deep purple L.indica flowers pink and red have significant difference,and the difference between white and purple significantly,pink and white L.indica flowers have significant difference damage rate,no significant difference between other colors.Selection responses of different color swatches in the single factor variance analysis results: P.gibbus on color taxis order: Deep Purple > white> pink >purple >red color of purple and pink and purple color palette was no significant difference,but with white and red color difference,difference selection the color palette is no significant difference in the other.Using the non parameter analysis of ?2,P.gibbus adults to different color Myrtle volatile substances two-way choice reaction results showed that the p.gibbus of different colors L.indica flowers preference order: Deep Purple > white> pink> purple > deep purple red,L.indica flowers selection was significantly higher than that of the other color L.indica flowers,was significantly higher than the control group on the purple and white,purple flowers to choose different L.indica flowers of pink and other significant difference between the different colors,but the difference was not significant.To sum up,the harm of p.gibbus to different colors of L.indica flowers is the result of visual and olfactory synergy.3 Through the analysis of SPME-GC-MS,we defined the primary components of different colors for L.indica flowers volatile alkanes and alkenes,aromatics,alcohols,esters,terpenes and polysiloxane,also contains aldehyde and ketone,nitrile and a small amount of sulfur compounds.The components and contents of volatile matter released from differentcolors and different florescence of L.indica were different,whose Hydrocarbons?Esters?Terpene would played important roles in the selection of the volatile matter of L.indica.4 Through the observation of insect p.gibbus in the field and indoor,summed up the occurrence of p.gibbus forecast method.The method is relatively stable,and the prediction results are consistent with the results of field investigation.The phenological periods of common plants and p.gibbus in Tai'an were established.The effective accumulated temperature prediction formula of effective eggs is N=(54.4±3.32)/[T-(13.98±0.88)].The relationship between the developmental period and temperature of eggs was fitted by nonlinear regression,and the correlation coefficient was 0.983,which showed that the N=50.719e-0.09 T index was very significant.The trend curve and the experimental curve of the development period of the P.gibbus eggs were basically consistent.