Effect of Intertunnel Distance and Nest-Surface Aspect on Progeny Production Rate and Sex Ratio in the Alfalfa Leafcutting Bee (Hymenoptera: Megachilidae)

1994 ◽  
Vol 87 (1) ◽  
pp. 27-30 ◽  
Author(s):  
V. J. Tepedino ◽  
D. R. Frohlich ◽  
Craig R. Baird
Keyword(s):  
Sex Ratio ◽  
Production Rate ◽  
Progeny Production

scholarly journals Effects of host and foundress density on reproductive strategy of Diaeretiella rapae

2012 ◽  
Vol 65 ◽  
pp. 294-294 ◽  
Author(s):  
R. Kant ◽  
M.A. Minor ◽  
S.A. Trewick ◽  
W.R.M. Sandanayaka
Keyword(s):  
Sex Ratio ◽  
Reproductive Strategy ◽  
Sex Allocation ◽  
Parasitic Wasp ◽  
Female Offspring ◽  
Reproductive Fitness ◽  
Brevicoryne Brassicae ◽  
Diaeretiella Rapae ◽  
Progeny Production ◽  
Total Parasitism

The reproductive fitness of a parasitoid depends on the oviposition decisions of a female in response to competition The present study investigated the oviposition and sex ratio of offspring produced by the parasitic wasp Diaeretiella rapae while competing with other conspecific females and at different host densities The number of Brevicoryne brassicae nymphs parasitised by female D rapae increased with the number of nymphs offered to them However the proportion of nymphs parasitised by the female decreased when nymph density was high The proportion of fertilised eggs oviposited by females decreased when nymph density increased An increase in the number of foundresses (females ovpositing together) increased the total parasitism but the contribution of each female (the number of nymphs each female parasitised) decreased Smaller proportions of female offspring were produced when females were competing for the same hosts The results of this study suggest that both host and foundress densities asymmetrically affect progeny production and sex allocation in this species

scholarly journals Quality deterioration of mass reared offsprings of Bracon hebetor in successive generations

2016 ◽  
Vol 13 (2) ◽  
pp. 1-12
Author(s):  
MS Alam ◽  
MZ Alam ◽  
SN Alam ◽  
MRU Miah ◽  
MIH Mian ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Significant Variation ◽  
First Generation ◽  
Galleria Mellonella ◽  
Progeny Production ◽  
Bracon Hebetor ◽  
Sixth Generation ◽  
Male Sex ◽  
Successive Generations ◽  
Wax Moth

A study was undertaken to determine the generation-wise parasitizing efficiency of mass reared Bracon hebetor on wax moth (Galleria mellonella). Two experiments were conducted to achieve the objectives. In the first experiment, the host larvae and parasitoid were released in the field micro plot during first generation and reared in the laboratory in subsequent generations. In another experiment, all generations were developed in the laboratory. In the first experiment, generation showed significant variation on sex ratio of adult progeny production. The male sex ratio increased with the range of 62.89 to 74.58% and female sex ratio declined ranging from 39 to 25% with the advancement of generations. The percent parasitization and adult progeny production was not influenced appreciably with the progress of generation. In the second experiment parasitization and adult progeny production did not vary significantly in successive generations. However there was a decreasing trend in parasitization from 95 to 55% by Bracon hebetor and adult progeny production by 47.5 to 15.5 adultsfemale-110 larvae-1 over generation. The sex ratio of adult progeny was significantly influenced by inbreed generation in laboratory reared population. Female decrease in sex ratio from first to sixth generation was 39.25 to 16.88%.SAARC J. Agri., 13(2): 1-12 (2015)

scholarly journals Density of Diachasmimorpha longicaudata (Ashmead) and host Ceratitis capitata (Wied) larvae for the increase of parasitoid female production

2018 ◽  
Vol 85 (0) ◽  
Author(s):  
Carlos Gustavo da Cruz ◽  
Clarice Diniz Alvarenga ◽  
Patricia Cristina do Carmo Oliveira ◽  
Edileuza dos Reis Souza Conceição ◽  
Zenobia Cardoso dos Santos ◽  
...  
Keyword(s):  
Biological Control ◽  
Sex Ratio ◽  
Ceratitis Capitata ◽  
Larval Density ◽  
Mortality Rates ◽  
Female Parasite ◽  
Progeny Production ◽  
Female Progeny ◽  
Diachasmimorpha Longicaudata ◽  
Pupal Mortality

ABSTRACT: The objective of the present study was to evaluate the ratio of Ceratitis capitata larvae/female of Diachasmimorpha longicaudata that results in the increase of parasitism and the production of females in the progeny. We used 8-day-old copulated D. longicaudata females with oviposition parasite experience and third instar larvae of C. capitata from rearing stock maintained at the Laboratory of Biological Control of Universidade Estadual de Montes Claros (Unimontes). Five densities of C. capitata larvae (10, 20, 30, 40, and 50) were offered to parasitoid females that were at five different densities (1, 2, 5, 10, and 15). The larvae were exposed to the parasitoid females by means of “parasitism units” in adapted cages for 1 hour. Sex ratio, percentage of parasitism, and pupal mortality were evaluated. Both host larval density and female parasite density influenced parasitism, female progeny production, and pupal mortality. Higher female production was observed in the progeny in ratios of 1:1 and 2:1 (larvae/females). Ratios above 1:2 reduced the sex ratio, and ratios below 1:1 caused high pupal mortality rates. The females had higher parasitism activity when they were in groups dividing the same space. Equal ratios of Ceratitis capitata larvae and parasitoid females resulted in improved efficiency in progeny females.

IRRADIATED PARASITIC WASPS: The Effect on Progeny Production and Sex Ratio

1962 ◽  
Vol 53 (6) ◽  
pp. 271-276 ◽  
Author(s):  
PAUL DEBACH ◽  
ERNEST B. WHITE
Keyword(s):  
Sex Ratio ◽  
Parasitic Wasps ◽  
Progeny Production

EFFECTS OF ADULT NUTRITION ON LONGEVITY, FECUNDITY, AND OFFSPRING SEX RATIO OF TRICHOGRAMMA MINUTUM RILEY (HYMENOPTERA: TRICHOGRAMMATIDAE)

1995 ◽  
Vol 127 (2) ◽  
pp. 245-254 ◽  
Author(s):  
J.A. Leatemia ◽  
J.E. Laing ◽  
J.E. Corrigan
Keyword(s):  
Sex Ratio ◽  
Mass Rearing ◽  
Progeny Production ◽  
Short Term ◽  
Offspring Sex Ratio ◽  
Offspring Production ◽  
Offspring Sex ◽  
Trichogramma Minutum ◽  
Potential Benefits

AbstractThe role of adult nutrition in longevity, progeny production, and offspring sex ratio of Trichogramma minutum Riley was examined. On average, honey-fed females lived 26.4 days and produced 260 offspring; unfed females lived 3.5 days and produced 80 offspring. Feeding on fructose or sucrose also significantly increased longevity and fecundity over unfed females (fructose, 23 days and 230 offspring; sucrose, 21 days and 230 offspring) but to a lesser degree than feeding on pure honey. Females fed yeast suspension or water had no significant increases in longevity or fecundity compared to unfed females. Offspring sex ratios of long-lived females were male-biased (50–62% males), those of short-lived females were female-biased (74–82% females). Lifetime reproduction of honey-fed females was highest at 20–25 °C and relative humidities of 20–80%, but short-term offspring production (during the first 2 days after emergence) was highest at 30 °C and 60–80% RH. Females that had access to honey for only a 24-h period did not increase their offspring production over the first 4 days of their lives when compared to unfed females. The potential benefits of feeding adult T. minutum for mass-rearing and field release are discussed.

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