Influence of parasitoid-host density and host availability on the laboratory propagation ofMicroctonus aethiops [Hym.: Braconidae] parasitoid ofHypera postica [Coleop.: Curculionidae]

Fusco, Robert A.; HowerJr, A. A.

doi:10.1007/bf02371511

Cited by 12 publications

(9 citation statements)

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“…Moreover, the pattern whereby most oviposition occurred early in the M. hyperodae life-span is similar to that observed in M. aethiopoides (Loan & Holdaway, 1961). Fusco and Hower (1974) found that at 23 ~ this species laid 41.7 % of its eggs in the first two days after mating. This is not necessarily typical of Microctonus spp.…”

Section: The Longevity and Fecundity Of M Hyperodae Longevitysupporting

confidence: 68%

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An investigation into the reproductive characteristics ofMicroctonus hyperodae (Hym.: braconidae), a parasitoid ofListronotus bonariensis (Col.: Curculionidae)

et al. 1995

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The reproductive tract of the parasitoid Microctonus hyperodae was found to comprise 6.1 + 0.2 ovarioles containing a total of 40-60 o(Scytes. After oviposition into its host Listronotus bonariensis, the parasitoid's egg volume increased by 205 times prior to hatching. At 19.1 ~ ovipositing M. hyperodae survived for a mean 21 + 4 days and laid a mean of 48 + 8 eggs. M. hyperodae collected from Colonia, Uruguay laid a mean of 62 + 15 eggs which was significantly more than the other ecotypes. Under caging conditions with an ample supply of hosts, M.hyperodae laid 51% of its eggs in the first 72 hours and on average 41% of the species' life-span occurred after the exhaustion of its egg supply. Minimum temperature for M. hyperodae oviposition was found to be c. 5 ~ beyond this the rate of increase in egg-laying was approximately linear until 30 ~ whereafter the rate fell abruptly. There was effectively no egg-laying at 39 ~ The parasitoid showed no preference for one host sex or the other either in the laboratory or under field conditions. Compared to other Microctonus spp., M. hyperodae appeared to show low fecundity and high longevity. The adaptive implications of this are discussed.

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Section: The Longevity and Fecundity Of M Hyperodae Longevitysupporting

confidence: 68%

“…The realised fecundity of M. hyperodae appeared to be greater than that of M. aethiopoides attacking adult H. postica (Fusco & Hower, 1974), similar to that of M. colesi (Drea et al, 1972) but relatively modest compared to other Microctonus spp. (table 3).…”

Section: The Longevity and Fecundity Of M Hyperodae Longevitymentioning

confidence: 89%

An investigation into the reproductive characteristics ofMicroctonus hyperodae (Hym.: braconidae), a parasitoid ofListronotus bonariensis (Col.: Curculionidae)

et al. 1995

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“…The sex ratio of Microctonus sp. under natural conditions was from 0.57 ± 0.11 to 0.69 ± 0.10, which is close to 1 male : 2 female, very close to 0.60-0.65 found in the nature in M. aethiops (Nees) (= aethiopoides Loan) by Fusco & Hower (1974). In the laboratory, the sex ratio ranged from 0.16 ± 0.13 to 0.37 ± 0.13 (Table 1), with a predominance of male parasitoids.…”

Section: Resultssupporting

confidence: 77%

“…In the New Zealand, the mean parasitism rate of L. bonariensis by Microctonus hyperodae was 58.7% (Goldson et al, 1993), with a ratio of 40 beetles : 1 female parasitoid. Fusco & Hower (1974) found a maximum parasitism of 51.6% when Hypera postica was parasitized by M. aethiops with 50:1 ratio, with a low percentage of premature mortality.…”

Section: Resultsmentioning

confidence: 90%

“…In the laboratory, the sex ratio ranged from 0.16 ± 0.13 to 0.37 ± 0.13 (Table 1), with a predominance of male parasitoids. Therefore, rearing conditions were probably inadequate for normal mating or the continuous oviposition produced more males, as demonstrated by Fusco & Hower (1974). Beetles parasitized by unfertilized females of Microctonus sp.…”

Section: Resultsmentioning

confidence: 99%

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Biology of Microctonus sp. (Hymenoptera: Braconidae), a parasitoid of Cyrtomon luridus BOH. (Coleoptera: Ccurculionidae)

Tironi¹,

Treuenfels²,

Parra³

2004

Sci. agric. (Piracicaba, Braz.)

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Cyrtomon luridus (Boh.), a native insect of wild Solanaceae, has adapted to the medicinal plant Duboisia sp., introduced from Australia, causing damages up to 100% mortality. Microctonus sp. is the most important natural enemy of C. luridus and its potential for biological control was investigated in this work. This study was carried out in Arapongas, Paraná State, Brazil, from 1994 to 1996. Parasitism of C. luridus by Microctonus sp. was highest from February through June (maximum of 54% in May 1996), when the C. luridus adult population was decreasing. The female sex ratio of Microctonus sp. under natural conditions was 0.57 to 0.69, which was close to 1 male : 2 female. Production of males occurs parthenogetically (arrhenotoky). In the laboratory, parasitism reached 40% when two adult C. luridus were exposed per parasitoid. The number of Microctonus sp. adults that emerged per parasitized beetle ranged from 4.7 to 14.2. Larvalpupal viability was 31.7 to 64.8% and the female sex ratio ranged from 0.0 to 0.37, with prevalence of males. The egg-pupal period was 12.7 days and the pupal-adult period was 10.7 days, resulting in a mean life cycle (egg-adult) of 22.4 days for this parasitoid (25ºC, 70% R.H.). This is the first report of a new species of Microctonus sp. in C. luridus.

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r and K strategies in some larval and pupal parasitoids of the gypsy moth

Barbosa

1977

Oecologia

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The investigations of the bionomics and parasitoid-host interactions of some gypsy moth parasitoids provide an opportunity to consider the role of r and K strategies in the life history of some tachinid and hymenopterous parasitoid species. Available historic data as well as results of recent studies are utilized in an attempt to evaluate the degree to which the data conform to this paradigm. Few studies have provided the information required to evaluate this concept particularly in a parasitoid complex. The concept of r and K also is discussed in relation to biological control strategies, and the implications of this analysis for those arguments are discussed.

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Influence of parasitoid-host density and host availability on the laboratory propagation ofMicroctonus aethiops [Hym.: Braconidae] parasitoid ofHypera postica [Coleop.: Curculionidae]

Cited by 12 publications

References 3 publications

An investigation into the reproductive characteristics ofMicroctonus hyperodae (Hym.: braconidae), a parasitoid ofListronotus bonariensis (Col.: Curculionidae)

An investigation into the reproductive characteristics ofMicroctonus hyperodae (Hym.: braconidae), a parasitoid ofListronotus bonariensis (Col.: Curculionidae)

Biology of Microctonus sp. (Hymenoptera: Braconidae), a parasitoid of Cyrtomon luridus BOH. (Coleoptera: Ccurculionidae)

r and K strategies in some larval and pupal parasitoids of the gypsy moth

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