Reproductive parameters and longevity of Gryon gallardoi (Brethes) (Hymenoptera: Scelionidae) parasitizing Spartocera dentiventris (Berg) (Hemiptera: Coreidae) eggs

Canto-Silva, Celson Roberto; Romanowski, Helena Piccoli

doi:10.1590/s1519-69842006000100004

Cited by 6 publications

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References 15 publications

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“…Similarly, observations on mean generation time (17.00 days) were similar to those found in Nechols et al (1989) and Sabbatini Peverieri et al (2012). Results in this study suggest population growth attributes of H. pennsylvanicus on L. zonatus are congruent with those identified from alternative hosts, and similar to trends from other species of Hadronotus and Gryon, including H. clavigrallae Mineo, H. gonikopalense, H. gallardoi (Bre ´thes), and H. philippinense (Ashmead) (Dasilao and Arakawa 2004;Canto-Silva et al 2006;Martel et al 2019;Romeis et al 2000). Given that these observations show similar trends in life history traits, data obtained on the total progeny produced, and therefore used to calculate estimates to R0 and GRR, are likely underestimated given that wasps were only provided eggs every other day for oviposition as opposed to daily, as demonstrated in Nechols et al (1989) and Sabbatini Peverieri et al (2012).…”

Section: Discussionsupporting

confidence: 81%

“…Hadronotus pennsylvanicus maintained a greater average proportion of female progeny (92.75 ± 1.52%) when provided L. zonatus eggs than when reared on hosts L. occidentalis (72.45%) and A. tristis (78%) (Nechols et al 1989;Sabbatini Peverieri et al 2012), and higher than Gryon spp. on alternative hemipteran hosts (Dasilao and Arakawa, 2004;Canto-Silva et al 2006;Martel et al 2019;Romeis et al 2000) when reared under similar laboratory conditions. H. pennsylvanicus exhibited a slower decline in the proportion of female progeny over time when provided L. zonatus eggs in comparison to L. occidentalis (Sabbatini Peverieri et al 2012).…”

Section: Discussionmentioning

confidence: 99%

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Evaluation of egg parasitoid Hadronotus pennsylvanicus as a prospective biocontrol agent of the leaffooted bug Leptoglossus zonatus

et al. 2022

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The western leaffooted bug, Leptoglossus zonatus (Dallas) (Heteroptera: Coreidae), is a key pest of almonds and pistachios in the USA. With limited monitoring strategies and no economic threshold developed, the use of broad-spectrum insecticides remains the primary control tactic for L. zonatus. In pursuit of more sustainable management options, experiments were carried out to assess the biocontrol potential of the egg parasitoid Hadronotus pennsylvanicus (Ashmead) (Hymenoptera: Scelionidae) against L. zonatus. Biological and demographical attributes of H. pennsylvanicus were evaluated under controlled laboratory conditions. Mated females lived on average 116 days. However, female longevity declined by 74% when provided with host eggs, and by 97% when deprived of a suitable diet. Females produced an average 39.70 offspring, with peak fecundity observed within the first week of their lifespan. The total progeny was on average 92.75% female. Non-reproductive host mortality accounted for > 52% of the total egg mortality observed within the first two weeks, and represented the majority of total host egg mortality thereafter. Age of host eggs did not influence parasitism rates. Under laboratory conditions, H. pennsylvanicus exhibits suitable demographic and reproductive traits as a candidate biocontrol agent of L. zonatus. Further research is needed to determine how to best manipulate and enhance H. pennsylvanicus populations to promote biocontrol of L. zonatus under field conditions.

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Section: Discussionsupporting

confidence: 81%