Broken wing fringe setae as a relative estimate of parasitoid age

2006 ◽  
Vol 121 (1) ◽  
pp. 87-92 ◽  
Author(s):  
Jana C. Lee ◽  
Gary L. Leibee ◽  
George E. Heimpel
Keyword(s):  
Parasitoid Age

PARASITISM OF LEPTINOTARSA DECEMLINEATA (SAY) EGGS BY EDOVUM PUTTLERI GRISSELL (HYMENOPTERA: EULOPHIDAE): EFFECTS OF HOST AGE, PARASITOID AGE, AND TEMPERATURE

1987 ◽  
Vol 119 (1) ◽  
pp. 75-82 ◽  
Author(s):  
J. Lashomb ◽  
D. Krainacker ◽  
R.K. Jansson ◽  
Y.S. Ng ◽  
R. Chianese
Keyword(s):  
Leptinotarsa Decemlineata ◽  
Total Mortality ◽  
Egg Parasitoid ◽  
Host Age ◽  
Edovum Puttleri ◽  
Age Classes ◽  
Preoviposition Period ◽  
Potato Beetle ◽  
Leptinotarsa Decemlineata Say ◽  
Parasitoid Age

AbstractParasitism of the Colorado potato beetle, Leptinotarsa decemlineata (Say), by Edovum puttleri Grissell, an exotic egg parasitoid, was studied in relation to the age of host eggs, the age of adult, female parasitoids, and temperature. Parasitism was greater in eggs ≤2 days old than in eggs older than 2 days. Eggs older than 2 days were killed primarily by probing and consequent desiccation. The percentage of eggs killed by probing was positively correlated with host age and negatively correlated with percentage parasitism. Total mortality of eggs from parasitism and probing did not differ among age classes. Following a 3-day preoviposition period, parasitism and probing increased with an increase in the age of females, peaked when adults were ca. 13 days old, and subsequently declined. Parasitism and probing were influenced by temperature: at 15 °C, no parasitism or probing was observed; above 15 °C, mortality from parasitism and probing increased with an increase in temperature up to 30 °C; above 30 °C, the number of eggs that were parasitized and probed decreased with an increase in temperature.

Production of the Parasitoid Cotesia marginiventris (Hymenoptera: Braconidae) in Unicellular Rearing Trays Using the Host Spodoptera exigua (Lepidoptera: Noctuidae)1

2004 ◽  
Vol 39 (3) ◽  
pp. 362-372 ◽  
Author(s):  
Eric W. Riddick
Keyword(s):  
Exposure Time ◽  
Spodoptera Exigua ◽  
Sex Ratios ◽  
Cotesia Marginiventris ◽  
Progeny Production ◽  
Parasitism Rate ◽  
Lepidopteran Larvae ◽  
Lepidoptera Noctuidae ◽  
Old Females ◽  
Parasitoid Age

Factors that might affect parasitism rate and progeny production of Cotesia marginiventris (Cresson), a solitary endoparasitoid of lepidopteran larvae, were considered in this study. Hosts were Spodoptera exigua (Hübner) larvae, which were feeding gregariously on artificial diet within 270-mL unicellular rearing trays. The following hypotheses were tested: (1) parasitism and superparasitism rates increased as exposure time and parasitoid density increased, and (2) progeny production decreased as parasitoid age increased. Parasitism rate increased significantly as exposure to S. exigua larvae increased from 2 to 6 h, but not from 6 to 18 h. Superparasitism rate was not affected significantly by exposure time. Both parasitism and superparasitism rates were greatest at a density of 3 rather than 1 parental parasitoid per tray; no differences were evident between densities of 3 vs 2 or 2 vs 1 parasitoid per tray. Significantly more offspring were produced (with normal sex ratios) when parental females were inserted into rearing trays as adults rather than as pupae (in cocoons). Also, 1- to 2-d-old and 8- to 9-d-old females produced more progeny (with normal sex ratios) than 15- to 16-d-old females. This study suggests that inserting a single, mated 1- to 9-d-old C. marginiventris female into a unicellular rearing tray containing an abundance of putative hosts could limit superparasitism without seriously reducing progeny production. Partial automated rearing of C. marginiventris is possible.

scholarly journals Impact of Trichogramma parasitoid age on the outcome of multiparasitism in the factitious host eggs of Chinese oak silkworm, Antheraea pernyi

2020 ◽  
Vol 93 (4) ◽  
pp. 1347-1357
Author(s):  
Asim Iqbal ◽  
Yang-Yang Hou ◽  
Yong-Ming Chen ◽  
Asad Ali ◽  
Lucie S. Monticelli ◽  
...  
Keyword(s):  
Antheraea Pernyi ◽  
Factitious Host ◽  
Parasitoid Age

Effect of Parasitoid and Host Age on Oviposition and Emergence of Microplitis croceipes (Hymenoptera: Braconidae) an endoparasitoid of Helvicoverpa zea (Lepidoptera: Noctuidae)

1993 ◽  
Vol 28 (4) ◽  
pp. 343-349 ◽  
Author(s):  
W. W. Harrison ◽  
D. A. Herbert ◽  
D. D. Hardee
Keyword(s):  
Helicoverpa Zea ◽  
Pupal Stage ◽  
Adult Emergence ◽  
Microplitis Croceipes ◽  
Host Age ◽  
Parental Age ◽  
Host Instar ◽  
Adult Wasp ◽  
Lepidoptera Noctuidae ◽  
Parasitoid Age

The effect of parasitoid age and two instars of the host Helicoverpa zea (Boddie) were investigated for the endoparasitoid, Microplitis croceipes (Cresson). Third and fourth instars of H. zea were exposed to three different age ranges (3 to 5, 6 to 8, and 12 to 15-d-old) of mated adult female M. croceipes. No significant differences were shown in rate of parasitism regardless of parasitoid age or host instar. Significant differences (P < 0.05) were found between parental age and adult wasp emergence, sex ratio, and number in pupal stage entering diapause. Six to 8-day-old parasitoids parasitizing third instar hosts yielded the highest percentage of adult emergence (47.5 ± 14%; X̄ ± SD), the highest percentage of females (79%), and the lowest percentage (4.5 ± 6%; X̄ ± SD) entering diapause during the test.

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