Effects of seasonal variation in host quality and availability on parasitism by the egg parasitoid <i><scp>T</scp>elenomus coloradensis</i>

Legault, Simon; Hébert, Christian; Berthiaume, Richard; Brodeur, Jacques

doi:10.1111/eea.12086

Cited by 5 publications

(6 citation statements)

References 32 publications

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“…The proportion of P. maculiventris eggs parasitized by T. podisi did not vary with the age of host eggs. Our results contrast with those of most studies of scelionids, where parasitism and emergence levels decrease as host egg age increases (Jubb & Watson, 1971;Awadalla, 1996;Olaye et al, 1997;Sousa & Spence, 2001;Hirose et al, 2003;Legault et al, 2013). These authors proposed that parasitism levels were lower in old host eggs either because females failed to oviposit (they rejected host eggs at a higher level) or their offspring failed to successfully exploit the nutritional resources in older host eggs.…”

Section: Discussioncontrasting

confidence: 99%

“…Typically, females prefer young to old eggs, and immatures develop better in young eggs than in old eggs (Pak, 1986;Barrett & Schmidt, 1991;Godin & Boivin, 2000). The host physiological suitability of hemlock looper, Lambdina fiscellaria Guen ee to the egg parasitoid Telenomus coloradensis Crawford decreases with embryonic development, and early diapause eggs are more suitable than post-diapausing eggs (Legault et al, 2013). However, other patterns of host acceptance and suitability related to host egg age have been observed (Godin & Boivin, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Increasing host age does not have the expected negative effects on the fitness parameters of an egg parasitoid

Zhou

Abram

Boivin

et al. 2014

Entomologia Exp Applicata

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Host age is an important determinant of host acceptance and suitability for egg parasitoids. As host embryonic development advances, the quality of resources available to the parasitoid offspring typically declines, usually resulting in reduced acceptance levels by foraging females and lower offspring fitness. We examined the ability of the parasitoid Telenomus podisi Ashmead (Hymenoptera: Scelionidae) to parasitize and develop in Podisus maculiventris (Say) (Hemiptera: Pentatomidae) eggs of different ages. In laboratory experiments, we measured the effect of host age (6, 24, 48, 72, 96, or 120 h old) on parasitism rate and offspring fitness parameters such as survival, development time, sex ratio, and size. Contrary to our expectations, parasitism rate did not differ between host age treatments, nor did sex ratio allocation, offspring size, or the fecundity of newly emerged female offspring. However, parasitoid offspring had a longer development time with increasing host age. This trend was stronger for males than for females, which we suggest could reduce the degree of protandry among offspring emerging from older host eggs, thus increasing the rate of virginity upon leaving the emergence patch and resulting in more frequent off‐patch mating by female offspring in nature. Overall, our results suggest that all stages of P. maculiventris embryonic development are suitable for acceptance and development of T. podisi. Unlike most species of egg parasitoids, T. podisi has evolved mechanisms to utilize host resources, regardless of host developmental stage, with relatively minor fitness consequences.

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Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Increasing host age does not have the expected negative effects on the fitness parameters of an egg parasitoid

Zhou

Abram

Boivin

et al. 2014

Entomologia Exp Applicata

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“…Therefore, studies on the effects of egg diapause and cold storage might enable a more appropriate comparison with our present case, but such studies are relatively scarce. Few studies yielded evidence that older eggs, either post-diapausing eggs or following prolonged cold storage, lost water and/or nutritional value, which would impair parasitoid fitness and/or survival (Alim and Lim 2010;Legault et al 2013;Mainali and Lim 2013). Thus, the contrary picture that emerged from our present study seems puzzling.…”

Section: Differences In Host Suitabilitycontrasting

confidence: 58%

Comparative study of development parameters of four Ooencyrtus spp. (Hymenoptera: Encyrtidae) on natural and factitious hosts

Samra

Ghanim

Protasov

et al. 2015

J Applied Entomology

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Biological control approaches such as seeding and augmentation releases of populations of natural enemies mostly rely on the indoor production of predator or parasitoid species, often with the use of alternative prey/host species. In this study, we investigated several development parameters of four egg parasitoid species: Ooencyrtus fecundus, O. near fecundus, O. pityocampae and O. telenomicida, and compared their performance on their natural host, the variegated caper bug (CB) Stenozygum coloratum, and on an alternative, factitious host, the silk moth (SM) Bombyx mori. Survival was higher and development duration shorter in CB eggs, making the CB a better host for these congeners. However, adult longevity was generally longer for individuals that developed in SM eggs. Moreover, O. fecundus and O. pityocampae females that had developed in SM eggs displayed higher fecundity than all other female/host combinations. Survival also varied according to the age of the SM eggs: parasitoid survival rates were significantly higher in 9-to 12-month-old (post-diapausing) eggs than in young (about 1 month old) ones. These results were probably influenced by differences among the egg sizes of the studied hosts. The number of non-laying females and self-superparasitism rates were exceptionally high in O. near fecundus. These findings suggest that SM eggs, and especially those which are being utilized after a long storage, could serve for mass rearing of the studied Ooencyrtus spp.

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“…However, more G. morrilli died on unfertilized than on fertilized H. vitripennis eggs (Krugner, 2014). Likewise, the egg parasitoid Telenomus coloradensis Crawford failed to complete development on unfertilized eggs of Lambdina fiscellaria Guen ee (Legault et al, 2013). Apparently the suitability of fertilized or unfertilized host eggs differs among egg parasitoid species.…”

Section: Discussionmentioning

confidence: 99%

“…Similar percentages of adult emergence and female progeny were found on fertilized, unfertilized, and UVF hosts for all three Trichogramma parasitoids, with an exception of the adult emergence of T. japonicum. Likewise, the egg parasitoid Telenomus coloradensis Crawford failed to complete development on unfertilized eggs of Lambdina fiscellaria Guen ee (Legault et al, 2013). However, more G. morrilli died on unfertilized than on fertilized H. vitripennis eggs (Krugner, 2014).…”

Section: Discussionmentioning

confidence: 99%

Effect of fertilized, unfertilized, and UV‐irradiated hosts on parasitism and suitability for Trichogramma parasitoids

Yang

Ying

et al. 2016

Entomologia Exp Applicata

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Trichogramma spp. (Hymenoptera: Trichogrammatidae) parasitoids have been commonly used as biological control agents in insect pest management. Host quality is believed to influence parasitism, host preference, and suitability for parasitoids. To date, limited studies have compared the parasitism of Trichogramma parasitoids on fertilized, unfertilized, and sterilized host eggs. Hence, we studied the performance of three Trichogramma egg parasitoids, Trichogramma japonicum Ashmead, Trichogramma chilonis Ishii, and Trichogramma leucaniae Pang & Chen, on fertilized, unfertilized, and ultraviolet (UV)-irradiated fertilized (UVF) eggs of rice moth, Corcyra cephalonica (Stainton) (Lepidoptera: Pyralidae). In a no-choice test, T. japonicum and T. leucaniae parasitized significantly more fertilized or UVF than unfertilized hosts, and T. chilonis parasitized significantly more UVF than either fertilized or unfertilized hosts. In a choice test, all three Trichogramma parasitoids parasitized UVF hosts the most, and unfertilized hosts the least. There were similar percentages of adult emergence and female progeny among fertilized, unfertilized, and UVF hosts for all three Trichogramma parasitoids, except that T. japonicum had significantly lower adult emergence on fertilized hosts. We also found that all three Trichogramma parasitoids developed slower on unfertilized hosts. Regardless of host treatments, T. leucaniae had the longest developmental time and T. chilonis had the shortest. We conclude that Trichogramma parasitoids prefer parasitizing UVF eggs of C. cephalonica without negative effects on their emergence and sex allocation.

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Effects of seasonal variation in host quality and availability on parasitism by the egg parasitoid Telenomus coloradensis

Cited by 5 publications

References 32 publications

Increasing host age does not have the expected negative effects on the fitness parameters of an egg parasitoid

Increasing host age does not have the expected negative effects on the fitness parameters of an egg parasitoid

Comparative study of development parameters of four Ooencyrtus spp. (Hymenoptera: Encyrtidae) on natural and factitious hosts

Effect of fertilized, unfertilized, and UV‐irradiated hosts on parasitism and suitability for Trichogramma parasitoids

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