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Platygaster hiemalis is an egg parasitoid of the Hessian fl y, Mayetiola destructor, a pest of both New Zealand wheat, Triticum aestivum (Tribe Triticeae), and prairie grass, Bromus willdenowii (Tribe Bromeae). The searching and ovipostion behaviour of P. hiemalis females in relation to Hessian fl y eggs oviposited on these two grass hosts was investigated. Individual females (n=15) were observed foraging for 60 min in an array of six wheat seedlings and six prairie grass seedlings, with all plants bearing Hessian fl y eggs (mean of 5-6 eggs), and plant type alternated within the array. Before being released into the array the female had oviposited but had not experienced either plant type as an adult. On average P. hiemalis females made 7.7 visits to plants during the 60 min observation period, with some of these being repeat visits to the same plant. Wheat plants were visited twice as frequently as prairie grass plants. Once on the plant, females on prairie grass plants were just as likely to fi nd eggs as females on wheat plants. These results indicate that P. hiemalis is potentially as effective at parasitising Hessian fl y in prairie grass pastures as in wheat fi elds.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Influence of grass species on the foraging behaviour of &lt;i&gt;Platygaster hiemalis&lt;/i&gt; a parasitoid of the Hessian fly &lt;i&gt;Mayetiola destructor&lt;/i&gt;