Egg Production and Longevity of Lygus hesperus (Hemiptera: Miridae) Adult Females Under Constant and Variable Temperatures

Brent, Colin S.; Spurgeon, D. W.

doi:10.18474/jes18-102

Cited by 4 publications

(4 citation statements)

References 43 publications

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“…Therefore, during our study the deleterious effects of periodic temperatures >31°C were apparently moderated by the intervening periods of lower temperature. Considering also the lack of influence by the high temperature regime on lifetime oviposition (Brent and Spurgeon 2019), our results suggest the population responses previously observed in irrigation studies in cotton were more likely the product of host preferences exhibited by the mobile adults, or altered relationships between L. hesperus and its natural enemy complex, rather than direct effects of the thermal environment on L. hesperus reproduction or survival.…”

Section: Discussionmentioning

confidence: 61%

“…Upon hatching, thirty first instars were assigned to each of six I30-BLL environmental chambers (Percival Scientific, Perry, IA) set at a photoperiod of 14:10 (L:D) h. Each chamber was set to one of six combinations of mean daily temperature (15, 22, or 29°C) and temperature regime (constant, variable). These treatment combinations were identical to those used by Spurgeon and Brent (2016) and Brent and Spurgeon (2019). The high variable temperature regime was intended to represent canopy temperatures in moderately drought stressed cotton (Wanjura et al 2004, Carmo-Silva et al 2012, Mahan et al 2012, Sui et al 2012).…”

Section: Methodsmentioning

confidence: 99%

“…Champlain and Butler (1967) reported that development times of L. hesperus eggs were similar under constant and variable temperatures, and Butler and Watson (1974) found that development times of all stages of L. hesperus under constant temperatures were predictive of development times under variable temperatures. Brent and Spurgeon (2019) examined oviposition under different constant and variable (±8°C) temperature regimes. They found that temperature influenced the rate of oviposition and longevity of adult females, but lifetime oviposition was unaffected by temperature regime.…”

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confidence: 99%

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Development and Survival ofLygus hesperus(Hemiptera: Miridae) Nymphs Under Constant and Variable Temperatures

Spurgeon

Brent

2019

Journal of Insect Science

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Thermal environments of the arid western United States are often harsh compared with the ranges of temperatures favorable for development and survival of crop insect pests. In cotton [Gossypium spp. (Malvales: Malvaceae)], new irrigation practices such as deficit irrigation may impact populations of pest and beneficial arthropods by temporarily altering temperature profiles within the plant canopy. Most information regarding the temperature-dependent development and survival of an important cotton pest, the western tarnished plant bug (Lygus hesperus Knight), is derived from constant temperature studies. We examined the development and survival of L. hesperus nymphs under constant (±0.2°C) and variable (±8°C) temperature regimes at daily mean temperatures of 15, 22, and 29°C. Under the low temperature (15°C), stadium lengths and duration of the nymphal stage were shorter when temperatures were variable compared with a constant temperature. No differences in development times were observed between regimes at the medium temperature (22°C). Except for the first stadium, development times under the high variable temperature regime were longer compared with the high constant regime (29°C). Nymph survival was unaffected by temperature regime except at the lowest temperature, where daily thermal fluctuations substantially improved survival compared with the constant conditions. These results suggest that temporarily increased crop canopy temperatures caused by altered irrigation schemes are unlikely to substantially reduce the growth of L. hesperus populations. However, enhanced nymphal development and survival under low variable temperatures likely contribute to the survival of overwintering L. hesperus in the absence of acute, low-temperature mortality.

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Section: Discussionmentioning

confidence: 61%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Development and Survival ofLygus hesperus(Hemiptera: Miridae) Nymphs Under Constant and Variable Temperatures

Spurgeon

Brent

2019

Journal of Insect Science

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“…However, RNAi efficiency varies greatly among different insects. Compared to other insects, RNAi is more efficient and systematic in Coleoptera insects, most notably the western corn rootworm, a devastating pest impacting corn production in the United States [42]. However, differences in intercellular transport, dsRNA-to-siRNA processing, and RNA-induced silencing complex formation can still affect RNAi efficiency [43].…”

Section: Discussionmentioning

confidence: 99%

RNA Interference-Mediated Knockdown of Tryptophan 2,3-Dioxygenase and Kynurenine-3-Monooxygenase in Monochamus Alternatus: Implications for Insect Control

Zhang

Weng

et al. 2023

Forests

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Monochamus alternatus Hope (Coleoptera: Cerambycidae), an invasive beetle that has caused billions of dollars in economic losses, is a serious pest of Pinus massoniana in many Asian countries. Clarifying the eye pigment gene and its knockdown phenotype of M. alternatus can provide functional gene identification and a marker for screening of gene editing, as well as help develop new control ideas. In this study, we first screened the transcriptome and found one homologous gene of tryptophan 2,3-dioxygenase (TDO) and one of kynurenine-3-monooxygenase (KMO). By measuring the expression levels of TDO and KMO in different developmental periods, it was indicated that TDO and KMO were expressed in various stages of M. alternatus. The gene expression of MaKMO was higher than MaTDO, showing high expression after pupation and decreasing at the beginning of eclosion. MaTDO and MaKMO were knocked down using RNA interference technology in different periods of expression, and the temporal expression changes were obtained using RT-qPCR technology. The results showed that the expressions of MaTDO and MaKMO were significantly inhibited by the injection of dsRNA; the expressions of MaTDO at 48 h, 96 h and after pupation were 21.9%, 32.3% and 59.2%, respectively, meanwhile, those of KMO were 23.4%, 25.0% and 69.7%, respectively. There was a significant change in eye color, and the beetles were able to pupate normally without their activity being affected. Therefore, both MaTDO and MaKMO can be used as tag genes for M. alternatus. A dominant marker system based on eye color can be developed for the genetic manipulation and control of M. alternatus.

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Reproductive Development of Lygus hesperus (Hemiptera: Miridae) Adults Under Constant and Variable Temperatures

Brent

Spurgeon

2019

Journal of Insect Science

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Egg Production and Longevity of Lygus hesperus (Hemiptera: Miridae) Adult Females Under Constant and Variable Temperatures

Cited by 4 publications

References 43 publications

Development and Survival ofLygus hesperus(Hemiptera: Miridae) Nymphs Under Constant and Variable Temperatures

Development and Survival ofLygus hesperus(Hemiptera: Miridae) Nymphs Under Constant and Variable Temperatures

RNA Interference-Mediated Knockdown of Tryptophan 2,3-Dioxygenase and Kynurenine-3-Monooxygenase in Monochamus Alternatus: Implications for Insect Control

Reproductive Development of Lygus hesperus (Hemiptera: Miridae) Adults Under Constant and Variable Temperatures

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