Effect of temperature on the egg viability and duration of egg development ofParahypopta caestrum

2004 ◽  
Vol 32 (4) ◽  
pp. 367-369 ◽  
Author(s):  
G. Salpiggidis ◽  
E. Navrozidis ◽  
M. J. Copland
Keyword(s):  
Effect Of Temperature ◽  
Egg Viability ◽  
Egg Development

PREDICTING THE TIME OF HATCH OF THE STRAWBERRY APHID, CHAETOSIPHON FRAGAEFOLII (HOMOPTERA: APHIDIDAE)

1984 ◽  
Vol 116 (8) ◽  
pp. 1131-1135 ◽  
Author(s):  
B.D. Frazer ◽  
D. A. Raworth
Keyword(s):  
Constant Temperature ◽  
Accurate Method ◽  
Effect Of Temperature ◽  
Controlled Environment ◽  
Egg Development ◽  
Thermal Threshold ◽  
Threshold Of Development ◽  
Time Of Collection

AbstractThe rate of hatch of overwintered eggs of the strawberry aphid, Chaetosiphon fragaefolii (Cockerell), at five temperatures in controlled environment chambers was used to determine the thermal threshold of development. Samples of eggs were taken from two field locations several times before hatch. These samples were subdivided and placed into two or three different constant temperature chambers. The day-degree requirements for hatching from the time of collection were estimated. These estimates corresponded to the number of day-degrees actually accumulated in the field between the time of egg collection and the time of hatching.This method of simulating the effect of temperature on egg development was an accurate method of predicting the time of hatch in the field at least 3 weeks prior to the observed time.

Factors Influencing Oviposition, and the Effect of Temperature on Development and Survival of Enoclerus lecontei (Wolcott) Eggs

1966 ◽  
Vol 98 (6) ◽  
pp. 579-585 ◽  
Author(s):  
Alan A. Berryman
Keyword(s):  
Food Consumption ◽  
Bark Beetles ◽  
Effect Of Temperature ◽  
Limiting Factor ◽  
Regression Equations ◽  
Optimal Conditions ◽  
Egg Development ◽  
Independent Variables ◽  
Factors Influencing ◽  
Enoclerus Lecontei

AbstractThe factors influencing oviposition and feeding of Enoclerus lecontei, and the effect of temperature on egg development and survival, were studied in the laboratory.When food was not a limiting factor, the total number of eggs laid, and the total number of bark beetles consumed by clerid pairs during their lives was strongly influenced by longevity of the female and to a lesser extent by female “vigor”. Female “vigor” and longevity were not necessarily coincident. The rate of oviposition and the rate of food consumption are mainly influenced by the “vigor” of the female clerid.The effect of suboptimal food on oviposition was determined. Regression equations are given for estimating the number of eggs laid utilizing three measures of food supply, number of bark beetles supplied, their weight, and number eaten. The independent variables may be used separately or combined as a multiple regression.Time for egg development varied from 5 days at 35 °C. to 28 days at 15 °C. Optimal conditions for development and survival were between 20° and 25 °C. Eggs can withstand cold storage (7° to 9 °C.) for 10 days before survival is impaired. Thereafter, mortality increases logarithmically until the 100 percentile is reached at about 43 days.

Reproductive patterns of the European corn borer (Ostrinia nubilalis) in Alberta

1987 ◽  
Vol 65 (7) ◽  
pp. 1733-1740 ◽  
Author(s):  
Dennis A. Lee ◽  
John R. Spence
Keyword(s):  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
Reproductive Period ◽  
High Rate ◽  
Effect Of Temperature ◽  
Egg Viability ◽  
Age Classes ◽  
Corn Borer ◽  
High Fecundity ◽  
Total Fecundity

Males and females of Ostrinia nubilalis (Hübner) from Alberta were held at constant and variable temperatures within a 17–32 °C range to determine the effect of temperature on longevity, daily oviposition, egg viability, total fecundity, reproductive period, and oviposition rate. The lower developmental thresholds and thermal summations for each stage were calculated from linear regressions. Moths from the South Saskatchewan River valley laid significantly more eggs over a longer period than those from the surrounding plains. The upper threshold for oviposition was higher (27 °C) for valley than for plains borers (25 °C). Optimum temperatures for egg viability were also higher for valley (25–27 °C) than for plains borers (22 °C). Fluctuating temperatures increased survival of both sexes compared with equivalent constant temperatures. Differences in male and female longevity likely arose in response to selection for different reproductive strategies in each sex. Long-lived individuals achieved high fecundity by reproducing at a low rate over many age-classes, while short-lived individuals reproduced at a high rate over few age-classes, with less total fecundity. Fecundity and reproductive period in the corn borer are plastic phenotypes that can change rapidly under differing environments.

scholarly journals Spatio-Temporal Model for Predicting Spring Hatch of the Spotted Lanternfly (Hemiptera: Fulgoridae)

2020 ◽  
Author(s):  
Erica C Smyers ◽  
Julie M Urban ◽  
Andrew C Dechaine ◽  
Douglas G Pfeiffer ◽  
Stephen R Crawford ◽  
...  
Keyword(s):  
Logistic Models ◽  
Effect Of Temperature ◽  
Temperature Threshold ◽  
Data Sets ◽  
Base Temperature ◽  
Combined Model ◽  
Egg Development ◽  
Developmental Duration ◽  
Egg Hatch ◽  
Spatio Temporal

Abstract The effect of temperature on the rate of spotted lanternfly, Lycorma delicatula (White) (Hemiptera: Fulgoridae), egg development was investigated for a population in Pennsylvania. Mean developmental duration (days ± SE) for egg hatch was evaluated at five constant temperatures of 19.9, 24.2, 25.1, 26.7, and 30°C using egg masses laid during the fall of 2018 and collected in 2019 from Berks Co., Pennsylvania. Base temperature thresholds for egg development were estimated using intercept and slope parameters by fitting a linear relationship between average temperature and developmental rate for the Pennsylvania study, two Korean studies, and the combined data sets. The base threshold estimates were then used to calculate seasonal accumulated degree-days (ADD) and construct logistic equations for predicting cumulative proportion of hatch in the spring. The fitted logistic prediction equations were then graphed against the egg hatch observations from field sites in Pennsylvania (2017) and Virginia (2019). When base temperature estimates from the three studies and combined studies were used to calculate ADD, the logistic models predicted similar timing for seasonal egg hatch. Because the slopes and intercepts for these four data sets were not statistically different, a base temperature threshold of 10.4°C derived from the combined model is a good estimate for computing ADD to predict spotted lanternfly spring emergence across a spatio-temporal scale. The combined model was linked with open source weather database and mapping programs to provide spatiotemporal prediction maps to aid pest surveillance and management efforts for spotted lanternfly.

scholarly journals Egg laying strategies and effect of temperature on egg development of Argulus siamensis

2012 ◽  
Vol 37 (2) ◽  
pp. 158-162 ◽  
Author(s):  
Pramoda Kumar Sahoo ◽  
Jyotirmaya Mohanty ◽  
Hemaprasanth ◽  
Banya Kar ◽  
Bikash Ranjan Mohanty ◽  
...  
Keyword(s):  
Egg Laying ◽  
Effect Of Temperature ◽  
Egg Development ◽  
Argulus Siamensis
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