Demographic Analysis of Sex Ratio on Population Growth of Bactrocera dorsalis (Diptera: Tephritidae) With Discussion of Control Efficacy Using Male Annihilation.
The life table data for the oriental fruit fly, Bactrocera dorsalis (Hendel), at different adult sex ratios (1♀: 1♂, 1♀: 50♂, 50♀: 1♂ free-choice mating, and 50♀: 1♂ no-choice mating) were collected to determine the effects of sex-ratio manipulation on current pest control procedures. At 1♀: 1♂, females mated, on average, 2.3 times during their lifetime with a mean fecundity (F) of 1,122 eggs. The net reproductive rate (R0), intrinsic rate of increase (r), finite rate (λ), and mean generation time (T) were 561.0 offspring, 0.1693 d- 1, 1.1844 d- 1, and 37.4 d, respectively. At 50♀: 1♂ free-choice mating, males mated 46.7 times during their lifetime, while at 50♀: 1♂ no-choice mating, males mated on average 50 times during their lifetime, and all females mating only once in both treatments. The values for F, r, and λ were significantly lower for both 50♀: 1♂ treatments than those in the 1♀: 1♂ group; the R0 values, however, were either equal to or even higher than those in the 1♀: 1♂ treatment. In the male-biased sex ratio (1♀: 50♂), fecundity was the highest (1,610 eggs) and female average life span the longest (166 d), while the R0 was the lowest (31.6 offspring) among all treatments. Population projections showed that even at a sex ratio of 50♀: 1♂, B. dorsalis could still produce a large number of offspring. These findings demonstrate that management strategies for controlling B. dorsalis could be properly evaluated by using demographic methods. Because female annihilation appears to be a more effective control strategy, it should be considered as a viable alternative.
Laboratory of Theoretical and Applied Ecology, Department of Entomology, National Chung Hsing University, 402 Taichung, Taiwan, Republic of China ( ybhuang@tari.gov.tw ; qpqjh@yahoo.com.tw ; hsinchi@dragon.nchu.edu.tw ).|Division of Applied Zoology, Agricultural Research Institute, 41362 Taichung, Taiwan, Republic of China.
Kevin
K
Yu-Bing Huang
Department of Plant Protection, Faculty of Agriculture, University of Yuzuncu Yil, 65080 Van, Turkey (ratlihan@yyu.edu.tr).
Remzi
R
Atlihan
Department of Plant Production and Technologies, Faculty of Agricultural Sciences and Technologies, Ömer Halisdemir University, 51240 Nigde, Turkey (ayhan.gokce@nigde.edu.tr).
Ayhan
A
Gökçe
Laboratory of Theoretical and Applied Ecology, Department of Entomology, National Chung Hsing University, 402 Taichung, Taiwan, Republic of China (ybhuang@tari.gov.tw; qpqjh@yahoo.com.tw; hsinchi@dragon.nchu.edu.tw).
Joyce
J
Yu-Bing Huang
Laboratory of Theoretical and Applied Ecology, Department of Entomology, National Chung Hsing University, 402 Taichung, Taiwan, Republic of China ( ybhuang@tari.gov.tw ; qpqjh@yahoo.com.tw ; hsinchi@dragon.nchu.edu.tw ).|Department of Plant Production and Technologies, Faculty of Agricultural Sciences and Technologies, Ömer Halisdemir University, 51240 Niğde, Turkey ( ayhan.gokce@nigde.edu.tr ).
Hsin
H
Chi
D000818:Animals; D005260:Female; D005298:Fertility; D015993:Life Tables; D008297:Male; D010572:Pest Control, Biological / Q000379:methods*; D011158:Population Growth; D012098:Reproduction; D012744:Sex Ratio; D033621:Tephritidae / Q000502:physiology
Bactrocera dorsalis; life table; population projection; sex ratio