Seasonal Patterns of Female<i>Homalodisca coagulata</i>(Say) (Hemiptera: Cicadellidae) Reproductive Physiology in Riverside, California

Hummel, Natalie A.; Zalom, Frank G.; Toscano, Nick C.; Burman, Prabir; Peng, Christine Y.S.

doi:10.1603/0046-225x-35.4.901

Cited by 25 publications

(18 citation statements)

References 26 publications

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“…The minimum number of generations required to produce a stable, persistent, H. vitripennis population was calculated to be 2.9 per year with more generations contributing to population growth. This figure of approximately three generations is consistent with work conducted by Hummel et al (2006) where populations of H. vitripennis in Riverside, CA, were collected, dissected, and assigned an ovarian rank to assess local vitellogenesis cycles. Dissection results suggested that there are two distinct generations per year with an occasional third (Hummel et al 2006 Hoddle 2006b, 2007), thereby enabling direct comparisons to previous studies.…”

Section: Discussionsupporting

confidence: 80%

“…Calculation ofthe number of generations using degree-days was slightly higher with 4-5 generations in the Riverside area. However, even though temperatures are theoretically favorable, H. vitripennis responds to shortening days over winter and largely ceases to lay eggs, thus it is unlikely 4-5 generations per year occur (Hummel et al 2006). In southern California, most H. vitripennis females dissected between August and January (i.e., late summer and early winter) are either postvitellogenic (percentage in category =50-60%), previtellogenic (>«20-40%), or vitellogenic (<10%; Hummel et al 2006).…”

Section: Discussionmentioning

confidence: 99%

“…However, even though temperatures are theoretically favorable, H. vitripennis responds to shortening days over winter and largely ceases to lay eggs, thus it is unlikely 4-5 generations per year occur (Hummel et al 2006). In southern California, most H. vitripennis females dissected between August and January (i.e., late summer and early winter) are either postvitellogenic (percentage in category =50-60%), previtellogenic (>«20-40%), or vitellogenic (<10%; Hummel et al 2006). This suggests that there is a very small proportion ofthe H. vitripennis population («10%) that can lay eggs over the winter producing very low densities of H. vitripennis nymphs.…”

Section: Discussionmentioning

confidence: 99%

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Calculation and Thematic Mapping of Demographic Parameters forHomalodisca vitripennis(Hemiptera: Cicadellidae) in California

Pilkington

Lewis

Jeske

et al. 2014

Annals of the Entomological Society of America

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Tbe reproductive and developmental biology, including life tables, for Homalodisca vitripennis (Cermar) (Hemiptera: Cicadellidae), the glassy-winged sharpshooter, were quantified at four constant temperatures in the laboratory: 20, 25, 30, and 33°C. Mean time from egg oviposition to adult death and mean female adult longevity was greatest at 25°C. Mean total progeny production was greatest at 25°C at 214 eggs per individual. Tbe percentage of females ovipositing at each experimental temperature was relatively low at 22, 46, and 56% at 20, 25, and 30°C, respectively. No oviposition occurred at 33°C. Upper, lower, and optimal developmental thresholds were calculated for all fife stages, and for egg to adult emergence these were 35.95, 13.99, and 29.45°C, respectively. Key demographic parameters were calculated and intrinsic rate of increase and net reproductive rate were highest at 30 and 25°C at 0.04 and 40.21 d, respectively. Mean generation times and population doubling times were lowest at 25 (97.66 d) and 30°C (15.51 d). Modefing of demographic parameters indicated that approximately three generations of H. vitripennis per year are needed for the existence of permanent populations. Historical weather data were used to map the number of generations and estimate net reproductive rates for H. vitripennis throughout California. Data presented here will be useful for modehng and estimating the possible invasion success of H. vitripennis in areas other than California.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Calculation and Thematic Mapping of Demographic Parameters forHomalodisca vitripennis(Hemiptera: Cicadellidae) in California

Pilkington

Lewis

Jeske

et al. 2014

Annals of the Entomological Society of America

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“…Where known to occur, glassy-winged sharpshooters overwinter as adults and reproduction is halted under natural conditions. In California, Hummel et al (2006) observed high proportions of postvitellogenic and previtellogenic females during the winter, compared with vitellogenic females. However, this arrest of reproduction often referred to as "reproductive diapause" was unexpected in captivity because winter rearing temperatures maintained in the greenhouse were very similar to those observed in the summer.…”

Section: Discussionmentioning

confidence: 92%

Life History Studies of Homalodisca vitripennis (Hemiptera: Cicadellidae), a Vector of Pierce's Disease of Grapevine

Lauzière¹,

Sétamou

2010

Annals of the Entomological Society of America

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Homafodisca vitripennis (Germar) (Hemiptera: Cicadellidae) vectors Xylella fastidiosa, a bacterium causing Pierce's disease in grapevine. The development and reproductive biology of this economically important insect species were studied under greenhouse and laboratory conditions during the spring—summer and fall—winter and at different rearing densities. The greenhouse was heated during the cool months to match summer temperatures and photoperiods were enhanced artificially. Longevity was affected by sex and season, with winter individuals living significantly longer than summer males (6.5-fold) and females (two-fold). Vitellogenesis was delayed in fall female H. vitripennis and a higher variability in lifetime fecundities was also observed. Longevity and the factors influencing it such as environmental conditions and availability of food sources are key factors determining fecundity in H. vitripennis. Offspring performance (developmental time, survival) was moderate during the cool months, although development of nymphs to adulthood was ≈13% greater. Rearing densities affected developmental time, survival, and egg production. Egg production per capita was higher in winter adults and the largest egg output was obtained at a rearing density of 100 nymphs per cage. Data presented herein suggest that nymph and adult H. vitripennis have evolved to ensure that only resistant stages are exposed to seasonal hazards. Captive adult females entered reproductive diapause in the fall as wild females would and despite warm greenhouse temperatures and long photoperiods and nymphal development decreased three- to six-fold during the fall-winter depending on rearing densities. These traits may be critical for the species to perpetuate in its native range.

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“…Glassy-winged sharpshooter females collected during summer months readily feed and oviposit in the laboratory (Sisterson 2008b(Sisterson , 2012. Further, the time frame over which females from a given population are reproductively active can be deÞned by repeated sampling followed by dissections to assess presence of mature eggs (Hummel et al 2006, Sisterson 2008b. The ability to collect large numbers of reproductively active females at deÞned periods during the year makes use of Þeld-collected glassy-winged sharpshooters an attractive option.…”

mentioning

confidence: 99%

Evaluation of a Method to Quantify Glassy-Winged Sharpshooter (Hemiptera: Cicadellidae) Egg Maturation During a Feeding Assay

Sisterson¹

2014

jnl. econ. entom.

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A method to improve an assay relating adult feeding to egg maturation by the glassy-winged sharpshooter (Hemiptera: Cicadellidae) was evaluated. The assay consisted on confining females to cowpea stems and quantifying feeding and egg maturation. Feeding was quantified by measuring excreta production. The number of eggs matured during the assay was estimated by taking the difference between female egg load (number of mature eggs carried by a female) at end of the assay (determined by dissection) and mean egg load of a subset of females dissected at start of the assay. Estimates of the number of mature eggs produced by females using the aforementioned approach improve as variability in egg loads of females entering the assay declines. As egg loads of females are variable, a pretreatment designed to reduce variance in egg loads of females entering the assay was evaluated. To accomplish this, females were divided into two groups. The control group was placed directly into the assay. The pretreatment group was given an oviposition period on sorghum before the assay. An oviposition period on sorghum was expected to reduce variance in egg load among females, as previous research found that sorghum was suitable for oviposition but provided poor nutrition for egg maturation. Dissection of a subset of females from each group before the assay determined that the mean and variance in egg load of females receiving the pretreatment was significantly reduced compared with females in the control group. Analysis of results from the feeding assay found that there was a significant relationship between feeding and egg maturation for females receiving the pretreatment, but not for females in the control group. Thus, reducing the mean and variance in egg load of females entering feeding assays resulted in detection of a significant positive relationship between feeding and egg maturation that otherwise would not have been observed.

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Seasonal Patterns of FemaleHomalodisca coagulata(Say) (Hemiptera: Cicadellidae) Reproductive Physiology in Riverside, California

Cited by 25 publications

References 26 publications

Calculation and Thematic Mapping of Demographic Parameters forHomalodisca vitripennis(Hemiptera: Cicadellidae) in California

Calculation and Thematic Mapping of Demographic Parameters forHomalodisca vitripennis(Hemiptera: Cicadellidae) in California

Life History Studies of Homalodisca vitripennis (Hemiptera: Cicadellidae), a Vector of Pierce's Disease of Grapevine

Evaluation of a Method to Quantify Glassy-Winged Sharpshooter (Hemiptera: Cicadellidae) Egg Maturation During a Feeding Assay

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