title: Inter-regional mating compatibility among Bactrocera dorsalis populations in Thailand (Diptera,Tephritidae).
abstract: Mating compatibility among recently colonized (wildish) populations of Bactrocera dorsalis (Hendel) from different geographic origins in Thailand was assessed through inter-regional mating tests. Outdoor octagonal nylon screen field cages containing single potted mango trees (Mangifera indica L.) were used. Sexual compatibility was determined using the index of sexual isolation (ISI), the male relative performance index (MRPI), and the female relative performance index (FRPI). The ISI values indicated that the northern population of Bactrocera dorsalis from Chiang Mai province was sexually compatible with the southern population of Bactrocera dorsalis (previously Bactrocera papayae) from Nakhon Si Thammarat province. The MRPI values showed that the northern males had a slightly higher tendency to mate than southern males, while the FRPI data reflected that females of both origins participated equally in matings. In all combinations there were no differences between homotypic and heterotypic couples in mating latency. Southern males tended to mate first with southern females, followed by northern males mating with northern females, while the latest matings involved heterotypic couples, in particular northern males mating with southern females. Overall, more couples were collected from higher parts of the field cage and the upper tree canopy, while there were no differences between the origins of flies in terms of elevation of couples within the cage. Laboratory assessments of fecundity showed no differences in the average number of eggs resulting from inter-regional crosses. Development of immature stages was also equal in the two hybrid crosses, with no differences found in the number of pupae produced, percentage pupal recovery, and percent adult emergence. The practical implication of this study is that colony of Bactrocera dorsalis derived from any northern or southern region of Thailand can potentially be used in sterile insect technique programs against this pest.
authors.affiliation: Department of Agricultural Extension, Ministry of Agriculture and Cooperatives, Chatuchak, Bangkok. 10900. Thailand.
authors.forename: Suksom
authors.initials: S
authors.lastname: Chinvinijkul
authors.affiliation: Department of Agriculture, Ministry of Agriculture and Cooperatives, Bangkok. Thailand.
authors.forename: Sunyanee
authors.initials: S
authors.lastname: Srikachar
authors.affiliation: Department of Agricultural Extension, Ministry of Agriculture and Cooperatives, Chatuchak, Bangkok. 10900. Thailand.
authors.forename: Phatchara
authors.initials: P
authors.lastname: Kumjing
authors.affiliation: Department of Agricultural Extension, Ministry of Agriculture and Cooperatives, Chatuchak, Bangkok. 10900. Thailand.
authors.lastname: Weera Kimjong
authors.affiliation: Department of Agricultural Extension, Ministry of Agriculture and Cooperatives, Chatuchak, Bangkok. 10900. Thailand.
authors.forename: Weerawan
authors.initials: W
authors.lastname: Sukamnouyporn
authors.affiliation: Department of Agriculture, Ministry of Agriculture and Cooperatives, Bangkok. Thailand.
authors.forename: Nongon
authors.initials: N
authors.lastname: Polchaimat
keywords: Populations; different geographic origins; field cages; mating compatibility; sterile insect technique