The Biological Characteristics And The Interspecific Competition Of Oriental Fruit Fly And Guava Fruit Fly

Bactrocera dorsalis and Bactrocera correcta both owns to fruit fly (Tephritidae), fruitfly,(Bactrocera) its host range, large production, harm is serious, is an importantquarantine pest worldwide.This article embarks from the insect population ecology principle, from June2012toNovember2013in Yunnan Agricultural University, Institute of Plant Protection helpchamber adopts the main harm of fruit chick high the banana, mango, ordinary carambola,estuary nan fung orange, European grapes and white loquat as materials, from the twokinds of fruit fly larvae feeding, the fecundity and the host, and so on, to orange small fruitfly and guava fruit fly interspecific competition has carried on the system research, obtainthe following results.1. Two kinds of fruit fly female worm eggs has obvious selectivity for the host, orangesmall fruit fly eggs on different host fruit selective: chick mans> ordinary carambola highbananas> estuary nan fung tangerine loquat> bai sha European grapes, guava fruit fly is:chick mans high bananas> estuary nan fung orange> baisha loquat> ordinarycarambola> European grapes. Seen from the results, two kinds of fruit fly all showed verystrong inclination to chick mans, grapes on the spawning at least in Europe. Fruit feedingtwo fruit fly larvae, the above results are basically consistent, two kinds of fruit fly withchick mans feeding larvae parasitized were the shortest, heaviest pupa eclosion rate ishighest, guava fruit fly and the orange small fruit fly larvae parasitized were6.29±1.11dand7.00±1.16d, pupa weight were0.0147±0.0017g and0.0161±0.0008g g, eclosion ratewere89.39%and89.55%respectively. Fruit fly female worm eggs for the host’s choice, mainly related to the host is conducive to the growth of their offspring, this is the result oflong-term interaction with host insects.2. Two kinds of different proportion of fruit fly, the density is the same case, theorange small fruit fly, with the increase of proportion of larvae pupate rate and adulteclosion rate increased, when the orange small fruit fly and guava fruit fly a ratio of3:1,orange small fruit fly pupae rate as high as85.00%, eclosion rate as high as57.50%; Whenthe orange small fruit fly and guava fruit fly larvae when the ratio of1:2pupa rate as highas68.75%, when1:1the pupa rate was34.17%, the lowest in the competitiveness of theorange small fruit fly is greater than the guava fruit fly. Proportion of two kinds of fruit fly,same density under different conditions, the food is plentiful, two kinds of fruit fly larvaecompetition phenomenon is not obvious, with the increase of larva density, small orangefruit fly enhance competition ability, in the orange small fruit fly and guava fruit flyproportion of cases, turns orange small fruit fly the pupa rate is87.50%, the maximum ofguava fruit fly pupae rate is the lowest34.17%; Guava fruit fly in proportion to5:5puparate is as high as80.00%, orange small fruit fly pupae rate is the lowest75%,2species offruit fly tended to decline trend in the long; In a competitive situation, guava fruit flyfemale worm is larger, the ratio of the unfavorable situation only increase the number offemale worm to increase the population viability.3. The two kinds of fruit fly on the same host eggs, mixed spawn a kind of fruit flypopulation affects the spawn of another kind of fruit fly, the experimental group orangesmall fruit fly pupae heavy orange small fruit fly pupae major cause is the same with thecontrol, trial group guava fruit fly pupae weight is0.0125g, the control group was0.0127g, the differences on0.05levels notable, shows two fruit fly eggs in the same hostcompetition, the competitiveness of the orange small fruit fly than guava fruit fly; Thefeather of two kinds of fruit fly is lower than the control group. Order of a fruit fly eggs tostudy the influence of another kind of fruit fly to spawn, when small orange fruit fly first tolay eggs, the pupa weight is higher than the control group, guava fruit fly pupae weight islower than the control group; When the guava fruit fly first to lay eggs, the pupa weight ishigher than the control group, the orange small fruit fly pupae weight is lower than the control group; Two kinds of fruit fly population under competitive conditions than singlebreeding populations, but the ratio of female worms are higher than the control group.4. Larvae feeding test results to confirm each other, and the fecundity of two kinds offruit fly were present at the time of feeding and oviposition curb the phenomenon of eachother, and both fruit fly are displayed when its population quantity is low, the ratio offemale worm will be increase, is a kind of insect to maintain the population reproductioncountermeasure.