Temperaturedependent development of parasitoids on two species of armoured scale insects

Logan, D.P.; Thomson, C.

doi:10.30843/nzpp.2002.55.3933

Cited by 8 publications

(6 citation statements)

References 10 publications

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“…), and several biological control studies have demonstrated this for hymenopteran parasitoids (Ables et al . ; Minkenberg ; Logan & Thomson ). In addition, some parasitoids that enter diapause at low temperatures are triggered by higher temperatures to break diapause and continue development (Hertlein ; Garcia et al .…”

Section: Discussionmentioning

confidence: 99%

Altitudinal variation of parasitic Hymenoptera assemblages in Australian subtropical rainforest

et al. 2014

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Patterns of species assemblages along altitudinal gradients provide insights into ecological patterns and processes. Parasitoids play an important role in ecosystems, yet there are few studies on parasitoid assemblages, partly because of difficulty in identification of parasitoids to species or their surrogates, morphospecies. The aim of this study is to assess differences in assemblages of parasitic Hymenoptera along an altitudinal gradient at both the family and morphospecies level, and the potential of environmental variables for explaining these differences. We sampled from four replicate sites at each of five elevations (approximately 300, 500, 700, 900 and 1100 m above sea level (asl)) within continuous subtropical rainforest of the Border Ranges National Park in New South Wales, Australia. At each site, we operated a Malaise trap for 10 days in December 2011 and again in February 2012. Parasitic wasps were sorted to families, and two of the common families (Diapriidae and Ichneumonidae) were further sorted to morphospecies. At both family and morphospecies level, we found gradual altitudinal turnover with a clear separation between 'upland' (900 and 1100 m asl) and 'lowland' (300 and 500 m asl) assemblages. Unlike parallel studies of some other major taxa, we did not detect distinct assemblages at each altitude at the taxonomic resolution used. In addition, response patterns were different between the two sampling occasions. Changes in assemblage composition were best explained by either altitude or temperature. Although parasitic Hymenoptera do not respond as clearly to changes in altitude as some other taxa, the changes detected here, even at the family level, are important given the role parasitoids play in ecosystem functioning.

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Section: Discussionmentioning

confidence: 99%

Altitudinal variation of parasitic Hymenoptera assemblages in Australian subtropical rainforest

et al. 2014

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“…Matadha et al (2004) evidenced that 15 and 30° C appear to be lower and upper temperature thresholds for E. citrina oviposition and larval development on San Jose scale, Q. perniciosus. Contrarily, Logan and Thompson (2002) observed extended development times of ≈75 and 125 d, with 95 % emergence of E. citrina at 15° C on both greedy and oleander scales, respectively. Accordingly, the effect of these extreme temperatures on the estimated biological parameters did not examine.…”

Section: Discussionmentioning

confidence: 86%

HOST AGE PREFERENCE AND TEMPERATURE-DEPENDENT SEARCHING EFFICIENCY OF Encarsia citrina, A PARASITOID OF Unaspis euonymi IN AUSTRIA.

Bayoumy

El-Kareim

Abdel-Salam

et al. 2009

Journal of Plant Protection and Pathology

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Encarsia citrina (Craw.) is considered as a promising parasitoid to be used as a bio-agent against the cosmopolitan diaspidid insect, Unaspis euonymi (Comstock). Laboratory studies were carried out to determine 1) the ovipositional preference of E. citrina for host's age by exposing it to 5-20 day-old scales 2) effect of temperature (17.5, 20, 25, and 28°C) and parasitoid's density (1, 2, 3, 4, and 5 females/30 hosts) on host searching efficiency of E. citrina. E. citrina significantly preferred 10 day-old scales with the highest emergence rate. Temperature had significant effect on the searching efficiency of E. citrina over the range of 17.5-28°C. The highest rate of search was obtained at 20°C. Although increasing parasitoid density at 20°C reduced progeny production in E. citrina due to the increase of mutual interference, it was able to distribute its eggs among the hosts more regularly. The highest values of killing (kvalue) were also obtained at 20°C and the ratio of 4 parasitoid females/30 hosts. The shortest and longest handling time (Th) was measured at 20 and 17.5°C, respectively. Accordingly, 20°C is suitable condition to Encarsia reproductive and activity. E. citrina seems to be a good candidate to control U. euonymi from late spring to early summer as well as during autumn in regions like Austria, where the temperature is frequently around 20°C. Therefore, parasitoid releases within these easons on the early 2 nd instar (10 days old) with a ratio of 1 parasitoid: 7.5 hosts have to be considered in the future biocontrol program of U. euonymi.

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“…The second hypothesis, that host population would affect the thermal phenotype of the parasitoid, was not supported by the results obtained, although such effects have been reported from other Trissolcus spp.-host combinations (e.g., Nozad Bonab & Iranipour, 2012). It is also true in other parasitoid-host systems (Logan & Thomson, 2002;Li & Mills, 2004).…”

Section: Discussionmentioning

confidence: 92%

Reciprocal crosses between two populations ofTrissolcus vassilievi(Mayr) (Hymenoptera: Scelionidae) reveal maternal effects on thermal phenotypes

Iranipour

Bena-Molaei

Asgari³

et al. 2015

Bull. Entomol. Res.

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The egg parasitoid Trissolcus vassilievi (Mayr) (Hymenoptera: Scelionidae) is a significant natural enemy of the sunn pest, Eurygaster integriceps Puton (Hemiptera: Scutelleridae), the most important pest of wheat in Iran. This study examined the developmental time and egg-to-adult survival of two geographically separate populations of T. vassilievi on two corresponding host populations at five constant temperatures ranging from 15.0 to 35.0 ± 1°C. No wasps of either population emerged at 15.0°C and the temperature threshold for development was similar between populations, ranging from 13.1 ± 0.3 to 13.8 ± 0.4°C for males and 12.2 ± 0.1 to 12.6 ± 0.1°C for females, but the thermal constant varied with gender and parasitoid population. Development of wasps from the colder Tabriz location was slower, with thermal constants for males and females of 172.6 ± 3.1 and 204.1 ± 1.2 degree-days, respectively, compared to Varamin wasps with 164.7 ± 3.0 and 195.6 ± 1.3 degree-days, respectively. Based on genetic inheritance patterns, reciprocal crosses between the two populations were expected to result in females with thermal phenotypes intermediate to their parental populations, and males that resembled their mothers. However, female progeny of crosses more closely resembled their maternal population, indicating a maternal effect on thermal phenotype. Furthermore, the magnitude of the maternal effect on the thermal constant was asymmetric and was more strongly expressed by Varmin than Tabriz females. These results suggest the possibility of using selective crosses between wasp populations, in combination with artificial selection in the laboratory, to tune the thermal phenotype of parasitoids to specific regions prior to augmentative releases.

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Temperaturedependent development of parasitoids on two species of armoured scale insects

Cited by 8 publications

References 10 publications

Altitudinal variation of parasitic Hymenoptera assemblages in Australian subtropical rainforest

Altitudinal variation of parasitic Hymenoptera assemblages in Australian subtropical rainforest

HOST AGE PREFERENCE AND TEMPERATURE-DEPENDENT SEARCHING EFFICIENCY OF Encarsia citrina, A PARASITOID OF Unaspis euonymi IN AUSTRIA.

Reciprocal crosses between two populations ofTrissolcus vassilievi(Mayr) (Hymenoptera: Scelionidae) reveal maternal effects on thermal phenotypes

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