Use of Pyriproxyfen to Induce Oogenesis in Diapausing Megacopta cribraria (Heteroptera: Plataspidae), and Evaluation of Pyriproxyfen-Induced Eggs for Rearing the Parasitoid Paratelenomus saccharalis (Hymenoptera: Scelionidae)

Penca, Cory; Goltz, Nicholas C; Hodges, Amanda; Leppla, Norman C.; Eger, J. E.; Smith, Trevor Randall

doi:10.3390/insects13010089

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…In addition, an unfavorable on the number of C. chilonis offspring caused by induced diapause in C. suppressali larvae was also observed in the F 1 generation (Figure 1E,F). Penca et al (2022) showed that the eggs produced by diapausing individuals of the kudzu bug, Megacopta cribraria (Fabricius), were parasitized by the egg parasitoid Paratelenomus saccharalis (Dodd); however, the emergence and fecundity of parasitoids were significantly reduced (Penca et al, 2022). In general, the fecundity of parasitoids can be affected by the environment and/or the physiological state of the host (Godfray & Shimada, 1999).…”

Section: Discussionmentioning

confidence: 99%

Effects of cold storage temperature, host status, and larval stage on the biological characteristics of Cotesia chilonis

Dong,

Zhu,

et al. 2024

Entomologia Exp Applicata

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Shelf life is an important determinant of the quality of parasitoids used as natural enemies in augmentation biological control. Cotesia chilonis (Munakata) (Hymenoptera: Braconidae), an obligate endoparasitoid of Chilo suppressalis (Walker) (Lepidoptera: Crambidae), has potential for use through augmentation biological control in China. Here, the effects of cold storage temperature, host status, and larval stage on the biological characteristics of C. chilonis were investigated to extend the agent's shelf life. Results showed that the number of healthy C. chilonis adults obtained was reduced by 3.5% and 47.7% when C. suppressalis larvae in either natural or induced diapause were used as hosts compared to nondiapausing control larvae. Both parasitism and cold storage significantly reduced the supercooling point of nondiapausing C. suppressalis larvae, whereas the opposite result was observed in those of natural diapause. In order to improve the long‐term storage of C. chilonis, nondiapausing C. suppressalis larvae were parasitized for 1, 3, 5, and 7 days to allow C. chilonis to develop into different larval stages before being transferred into cold storage for 30 days at 4 or 10°C. Compared to the control, the C. chilonis cocoon formation and emergence rates of the 1‐day‐old egg treatment group held at 10°C were reduced by 15% and 17%, respectively. The results also showed that the duration of the larval stage of C. chilonis was prolonged fourfold after storage at 4 and 10°C. Individuals held at 10°C had a significantly longer cocoon and adult stage compared to those held at 4°C. The biological parameters and life history of the F1 generation of C. chilonis returned to normal levels under laboratory conditions. In conclusion, C. suppressalis larvae were successfully used to extend the shelf life of C. chilonis for use in augmentative biocontrol programs.

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Section: Discussionmentioning

confidence: 99%

Effects of cold storage temperature, host status, and larval stage on the biological characteristics of Cotesia chilonis

Dong,

Zhu,

et al. 2024

Entomologia Exp Applicata

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Effects of pyriproxyfen on development and hormone of the aphis, Aphis craccivora (Hemiptera: Aphididae)

Li,

Zhang,

Zhang

et al. 2024

Journal of Economic Entomology

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Pyriproxyfen (PPF) has been shown to affect the pupal stage and ecdysone levels in holometabolous insects, such as silkworms and mealworms. It remains unknown whether it affects hemimetabolous insects with their hormone levels in insects lacking a pupal stage. In this laboratory study, bioassays were conducted to investigate the effects of varying doses of PPF on Aphis craccivora Koch (Hemiptera: Aphididae). Ultraperformance liquid chromatography–tandem mass spectrometry (UPLC–MS/MS) was used to determine the types and titers of juvenile hormone (JH) and 20-hydroxyecdysone (20E). Additionally, the effects of PPF on A. craccivora reproduction and molting, as well as its influence on relevant gene expression, were examined. The results revealed LC50 and LC90 values of 3.84 and 7.49 mg/l for PPF, respectively, after 48 h of exposure. The results demonstrated a significant reduction in the titer of JH III and a significant increase in the titer of 20E following treatment with PPF. However, there was no significant decrease observed in the titer of JH III skipped bisepoxide (JH SB3). A sublethal concentration of PPF was found to inhibit Krüppel homolog 1 (kr-h1) gene expression and reduce aphid reproduction, but it did not significantly impact ecdysone receptor expression and aphid molting. The results of this study demonstrate that PPF exhibits a lethal effect on aphids, thereby providing an effective means of control. Additionally, sublethal concentrations of PPF have been found to inhibit the JH in aphids, resulting in a decline in their reproductive ability and achieving the desired control objectives.

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Use of Pyriproxyfen to Induce Oogenesis in Diapausing Megacopta cribraria (Heteroptera: Plataspidae), and Evaluation of Pyriproxyfen-Induced Eggs for Rearing the Parasitoid Paratelenomus saccharalis (Hymenoptera: Scelionidae)

Cited by 2 publications

References 31 publications

Effects of cold storage temperature, host status, and larval stage on the biological characteristics of Cotesia chilonis

Effects of cold storage temperature, host status, and larval stage on the biological characteristics of Cotesia chilonis

Effects of pyriproxyfen on development and hormone of the aphis, Aphis craccivora (Hemiptera: Aphididae)

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