| Autor: |
Muchemi, Samuel K, Zebitz, Claus P W, Borgemeister, Christian, Akutse, Komivi S, Foba, Caroline N, Ekesi, Sunday, Fiaboe, Komi K M |
| Zdroj: |
Environmental Entomology; June 2018, Vol. 47 Issue: 3 p692-699, 8p |
| Abstrakt: |
Liriomyzaspp., leafminer flies (Mik; Diptera: Agromyzidae), are economically important quarantine pests that puncture and mine leaves and fruits of various horticultural crops worldwide, affecting yield and trade. Halticoptera arduine(Walker; Hymenoptera: Pteromalidae), a key parasitoid from the pests’ areas of origin in South America, was introduced as a potential alternative management strategy. Prior to H. arduinerelease, its potential interactions with the dominant local ectoparasitoid, Diglyphus isaea(Walker; Hymenoptera: Eulophidae), were assessed. Halticoptera arduineand D. isaeawere released in single, sequential and simultaneous combinations on Liriomyza huidobrensis(Blanchard; Diptera: Agromyzidae) to evaluate possible effect on the parasitism rate, reproduction and host mortality. The combination of both parasitoids did not significantly affect the specific parasitism rates of either of them, an indication that H. arduineand D. isaeacan coexist. Parasitism rates of the exotic H. arduinewere significantly superior to the indigenous D. isaeain all release combinations except when both species were released simultaneously. While 50 individuals of D. isaearesulted only in 21.23 ± 2.1% parasitism, 50 parasitoids composed of 25 H. arduineand 25 D. isaeacaused 53.27 ± 4.99%. Both parasitoids further induced significant nonreproductive host mortalities. Both parasitoids’ F1 progenies sex ratios were female-biased in all parasitoid release combinations except in single release of D. isaeawith a balanced sex ratio. The improvement in D. isaea’s sex ratio induced by the presence of H. arduinesuggests a synergetic effect on D. isaea’s reproductive performance. The introduction of H. arduinein horticulture production systems may therefore improve natural control of Liriomyzaleafminers in East Africa. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
