Estimation of native populations of male Dacus spp. by Jolly's stochastic method using a new designed attractant trap in a village ecosystem in Peninsular Malaysia

Tan K.H., . Estimation of native populations of male Dacus spp. by Jolly's stochastic method using a new designed attractant trap in a village ecosystem in Peninsular Malaysia. pp. 87-95. ISSN 0127-6883

A new designed attractant (ND) trap to capture live Dacus male adults was described. Traps with various port sizes (6-11 mm d) and those with two and three entrances ports showed no significant differences in the number of flies caught per day. However in all instances the ND trap caught less flies than a clear cylindrical trap. The ND traps were used to estimate populations of adult male Dacus dorsalis and D. umbrosus in a small village in Penang. Daily estimation of D. dorsalis for 11 days in October 1983 showed population varied between 570 and 2 000 males with probability of survival between 0.58 and 1.0. Extender traps placed ca 0.5 and 1 km from the village caught 16 marked D. dorsalis flies at 0.5 km north and south positions while the rest caught only unmarked flies during the 11 days. Weekly population estimates between January-March 1984 were between 1 400 and 2 600 male flies for D. dorsalis (probability of survival 0.40-0.72); and between 780 and 2 050 male flies for D. umbrosus (probability of survival 0.33-0.86). The capture index varied between 0.1 and 0.35 for daily estimation of D. dorsalis. However for weekly estimation the capture indices were consistent 0.14-0.19 for D. dorsalis and 0.14-0.18 for D. umbrosus

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Abstract

A new designed attractant (ND) trap to capture live Dacus male adults was described. Traps with various port sizes (6-11 mm d) and those with two and three entrances ports showed no significant differences in the number of flies caught per day. However in all instances the ND trap caught less flies than a clear cylindrical trap. The ND traps were used to estimate populations of adult male Dacus dorsalis and D. umbrosus in a small village in Penang. Daily estimation of D. dorsalis for 11 days in October 1983 showed population varied between 570 and 2 000 males with probability of survival between 0.58 and 1.0. Extender traps placed ca 0.5 and 1 km from the village caught 16 marked D. dorsalis flies at 0.5 km north and south positions while the rest caught only unmarked flies during the 11 days. Weekly population estimates between January-March 1984 were between 1 400 and 2 600 male flies for D. dorsalis (probability of survival 0.40-0.72); and between 780 and 2 050 male flies for D. umbrosus (probability of survival 0.33-0.86). The capture index varied between 0.1 and 0.35 for daily estimation of D. dorsalis. However for weekly estimation the capture indices were consistent 0.14-0.19 for D. dorsalis and 0.14-0.18 for D. umbrosus

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Item Type:	Article
Additional Information:	7 tables; 16 ref. Summaries (En Malay)
AGROVOC Term:	DACUS
AGROVOC Term:	POBLACION
AGROVOC Term:	ATRAYENTES
AGROVOC Term:	MALASIA PENINSULAR/ CAZA CON TRAMPA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:53
URI:	http://webagris.upm.edu.my/id/eprint/18678

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