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- W2947478052 abstract "An Oriental fruit fly, Bactrocera dorsalis Hendel, is one of the most problematic tephritidfruit flies due to the severe damages caused to commercial fruits such as mango(Mangifera indica L.). However, the information on biology and ecology of this tephritidspecies particularly on mango variety is still lacking. Thus, this study aimed toinvestigate its infestation level through damaged mango fruits collection during mangofruiting season from four Chokanan mango orchards with different managementpractices in Jitra, Kedah (organic orchard), Bumbong Lima, Penang (unmanagedorchard), Bukit Changgang, Selangor (Good Agricultural Practices orchard) and PulauGadong, Malacca (conventional orchard). In addition, population fluctuation of B.dorsalis in the same mango orchards was conducted using methyl eugenol traps frommango flowering stage until harvesting stage. Moreover, the life table and demographicparameters from three cohorts of B. dorsalis eggs as well as the oviposition behaviourand offspring of B. dorsalis females on three different Chokanan mango ripening stages(i.e. unripe, ripe and fully-ripe) at five replication were determined in the laboratory.Results show the highest fruit infestation rate was recorded in Bumbong Lima(93.09±9.00 pupae/kg) due to no proper integrated control of fruit flies was conductedwhilst Jitra showed the lowest infestation rate (10.74±1.25 pupae/kg) due to bettercontrol of fruit fly populations. Among the total of 5,229 Bactrocera pupae collectedfrom infested fruits and 33,467 male flies collected from methyl eugenol traps, B.dorsalis showed significantly the highest numbers (P<0.05) compared to B. carambolaein all locations indicating that it is a dominant species and a major fruit fly pest of mangoin Malaysia. Bactrocera dorsalis populations show similar fluctuation trends in mostlocations which the flies number start to increase in week 8 to 10 and peak numbers wererecorded in week 14 to 16 because at this point the fruits reached the matured and ripestages, which the most favourable stage for B. dorsalis females to lay eggs. Monthlyrelative humidity contributed significantly towards the population fluctuation of B.dorsalis in Pulau Gadong, Bumbong Lima and Jitra. However, only rainfall contributedsignificantly towards the population fluctuation of B. dorsalis in Bukit Changgang. Bothabiotic factors are closely related to the B. dorsalis pupae development and adult emergence which they depend on the moist condition in soil and air. Age-specificsurvival (lx) indicated that 22.33% B. dorsalis eggs successfully reached to adults. Thehighest mortality recorded was in the 1st instar larvae (48.59%) with K-value of 0.289and the pattern of survivorship curves falls in type III. This high mortalities may beregarded as the key factor regulating the population size of B. dorsalis. Age specificfecundity (mx) showed the earliest egg laying on day 35 and the last female died on day69. The female laid on average 410.0±61.22 eggs. The intrinsic rate of natural increase(rm) was 0.06 per female per day with mean generation time (Tc) of 46.39 days. The netreproductive rate (Ro) was 13.68 female offspring per female. Doubling time occurred in12.38 days. This showed that the population of B. dorsalis has rapid buildup in shortperiod of time. Fully-ripe mango was relatively preferred by B. dorsalis females to visitand oviposit eggs followed by the ripe mango in no-choice and choice experiment. Incontrast, unripe mango was the least preferred for eggs oviposition by B. dorsalis in bothexperiments. This indicated that the fully-ripe stage is more susceptibility in terms offruit characteristics and nutrient contents." @default.
- W2947478052 created "2019-06-07" @default.
- W2947478052 creator A5065884074 @default.
- W2947478052 date "2017-11-01" @default.
- W2947478052 modified "2023-09-26" @default.
- W2947478052 title "Bioecology of oriental fruit fly (Bactrocera dorsalis Hendel) on mango (Mangifera indica L.) in orchards under four different management practices" @default.
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