The Influence of Host Deprivation and Host Source on the Reproductive Biology and Longevity of the Squash Bug Egg Parasitoid Gryon pennsylvanicum (Ashmead) (Hymenoptera: Scelionidae)

1993 ◽  
Vol 3 (2) ◽  
pp. 148-154 ◽  
Author(s):  
E.A. Vogt ◽  
J.R. Nechols
Keyword(s):  
Reproductive Biology ◽  
Egg Parasitoid ◽  
Squash Bug ◽  
Host Deprivation

scholarly journals Impact of the Egg Parasitoid,Gryon pennsylvanicum(Hymenoptera: Scelionidae), on Sentinel and Wild Egg Masses of the Squash Bug (Hemiptera: Coreidae) in Maryland

2016 ◽  
Vol 45 (2) ◽  
pp. 367-375 ◽  
Author(s):  
Mary L. Cornelius ◽  
Matthew L. Buffington ◽  
Elijah J. Talamas ◽  
Michael W. Gates
Keyword(s):  
Egg Parasitoid ◽  
Egg Masses ◽  
Squash Bug

scholarly journals Ovipositional Behavior of the Egg Parasitoid Gryon pennsylvanicum (Hymenoptera: Scelionidae) on Two Squash Bug Species Anasa tristis (Hemiptera: Coreidae) and Anasa armigera: Effects of Parasitoid Density, Nutrition, and Host Egg Chorion on Parasitism Rates

2020 ◽  
Vol 49 (6) ◽  
pp. 1307-1315
Author(s):  
Mary L Cornelius ◽  
Bryan T Vinyard ◽  
Joseph D Mowery ◽  
Jing S Hu
Keyword(s):  
Electron Microscopy ◽  
Laboratory Tests ◽  
Egg Parasitoid ◽  
Egg Masses ◽  
Anasa Tristis ◽  
Ovipositional Behavior ◽  
Squash Bug ◽  
Percent Parasitism ◽  
Transmission Electron ◽  
Parasitism Rates

Abstract This study examined the ovipositional behavior of Gryon pennsylvanicum Ashmead (Hymenoptera: Scelionidae) on egg masses of two squash bug species Anasa tristis DeGeer and Anasa armigera Say (Hemiptera: Coreidae) by evaluating how parasitoid density and access to nutrition influenced percent parasitism on egg masses of different sizes in laboratory tests. When three parasitoids were exposed to A. tristis egg masses with only three to five eggs, 72.7% of parasitoids became trapped in the eggs and failed to emerge successfully. These results suggest that competition between larvae within the egg may have reduced the fitness of the surviving parasitoid. Continual access to honey water did not significantly influence parasitism rates on A. armigera egg masses and only increased parasitism on A. tristis egg masses with 20–25 eggs. Overall, parasitism rates were higher on A. armigera egg masses than on A. tristis egg masses, and parasitoids were more likely to emerge successfully from A. armigera eggs than from A. tristis eggs. Parasitoids spent the same amount of time probing eggs of the two species, but they spent significantly more time drilling into A. tristis eggs than A. armigera eggs. Measurements taken using transmission electron microscopy determined that the average combined width of the epicuticle and exocuticle of the egg chorion was significantly greater for A. tristis eggs than for A. armigera eggs. This difference may account for the lower rates of parasitism and parasitoid emergence and for the increased time spent drilling into A. tristis eggs compared with A. armigera eggs.

scholarly journals Use of Flowering Plants to Enhance Parasitism and Predation Rates on Two Squash Bug Species Anasa tristis and Anasa armigera (Hemiptera: Coreidae)

Insects ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 318 ◽  
Author(s):  
Cornelius ◽  
Vinyard ◽  
Gates
Keyword(s):  
Egg Parasitoid ◽  
Egg Masses ◽  
Anasa Tristis ◽  
Future Studies ◽  
Squash Bug ◽  
Parasitism Rates ◽  
Adult Parasitoid ◽  
Egg Parasitism ◽  
Fagopyrum Esculentum Moench ◽  
Predation Rates

A two-year study evaluated the effect of a flowering border of buckwheat Fagopyrum esculentum Moench on rates of egg parasitism, egg predation and adult parasitism on two squash bug species, Anasa tristis (DeGeer) and Anasa armigera Say, by comparing rates in squash fields with and without a flowering border. Furthermore, we evaluated whether there was an edge effect by comparing parasitism and predation rates in plots located in the corner of a squash field with plots located in the center of a squash field for fields with and without a flowering border. The egg parasitism rates were not affected by either treatment (flowering border or control) or plot location (edge or center). Anasa armigera egg masses only accounted for 4.3% of the total egg masses collected. The egg parasitism rates increased gradually throughout the season, peaking in the last week of August in 2017 at 45% for A. tristis egg masses. The most common egg parasitoid recovered was Gryon pennsylvanicum (Ashmead) followed by Ooencyrtus anasae (Ashmead). Adult parasitism was not affected by treatment, but A. tristis adult parasitism rates were higher in plots located on the edge of squash fields compared with plots located in the center of squash fields in 2016. Since adult parasitoid, Trichopoda pennipes (Fabricius) flies were observed visiting buckwheat flowers, future studies could explore the possibility that the flowering buckwheat may have a more impact on adult parasitism if there was a greater distance between fields with and without a flowering border.

Biology and field performance ofGryon clavigrallae(Hymenoptera: Scelionidae), an egg parasitoid ofClavigrallaspp. (Hemiptera: Coreidae) in India

2000 ◽  
Vol 90 (3) ◽  
pp. 253-263 ◽  
Author(s):  
J. Romeis ◽  
T.G. Shanower ◽  
K. Madhuri
Keyword(s):  
Sex Ratio ◽  
Cluster Size ◽  
Host Density ◽  
Field Performance ◽  
Egg Parasitoid ◽  
Developmental Threshold ◽  
Adult Females ◽  
Threshold Temperatures ◽  
Cluster Density ◽  
Host Deprivation

AbstractThe biology and impact ofGryon clavigrallaeMineo, an egg parasitoid ofClavigralla scutellarisSpinola andC. gibbosa(Westwood), was investigated. The calculated developmental threshold temperatures for females and males were 15.6°C and 15.8°C, respectively. Emergence exceeded 94% at temperatures between 22 and 30°C. Adult females lived on average 28–96 days when fed with honey. Without food, adults lived < 6 days. Mean fecundity was 56.4 eggs per female. A significant trend of lower fecundity after longer periods of host deprivation was observed.Gryon clavigrallaefemales successfully oviposited in host eggs of all ages though eggs < 4 days old were preferred. Total host handling times were significantly longer onC. gibbosaeggs (23.5 min) than onC. scutellariseggs (12.0 min). Females readily distinguished parasitized from non-parasitized host eggs. Superparasitism was observed when few or no unparasitized eggs were available. Eggs of the twoClavigrallaspecies can be separated by surface structure and condition after eclosion.Clavigralla scutellarislaid significantly larger egg clusters thanC. gibbosa(19.9 versus 10.5 eggs per cluster).Gryon clavigrallaewas present as soon as the firstClavigrallaspp. egg clusters were found on pigeonpea. The percentage of egg clusters parasitized increased early in the season with egg cluster density and remained high (up to 83%) despite fluctuations in host density. Overall,G. clavigrallaeparasitized 40 and 58% ofC. gibbosaandC. scutellariseggs. The percentage of egg clusters parasitized and the number of eggs parasitized per cluster increased significantly with egg cluster size. The overall parasitoid sex ratio was highly female biased but varied with the number of eggs parasitized per cluster.

scholarly journals Reproductive Biology of Fidiobia dominica (Hymenoptera: Platygastridae), an Egg Parasitoid of Diaprepes abbreviatus (Coleoptera: Curculionidae)

2007 ◽  
Vol 36 (2) ◽  
pp. 376-382 ◽  
Author(s):  
Rita E. Duncan ◽  
Bryan J. Ulmer ◽  
Jorge E. Peña ◽  
Stephen L. Lapointe
Keyword(s):  
Reproductive Biology ◽  
Egg Parasitoid ◽  
Diaprepes Abbreviatus
Sign in / Sign up

Export Citation Format

Share Document