Journal of Economic Entomology (1996) 89, 562-567

S. Lhaloui, J.H. Hatchett and G.E. Wilde (1996)
Evaluation of New Zealand barleys for resistance to Mayetiola destructor and M. hordei (Diptera: Cecidomyiidae) and the effect of temperature on resistance expression to Hessian fly
Journal of Economic Entomology 89 (2), 562-567
Abstract: Six New Zealand barleys were evaluated for resistance to biotype L of the Hessian fly, Mayetiola destructor (Say), the most virulent biotype that infests wheat in the United States. Three of the barleys, 'Gwylan', `WPBS 3I6/80', and 'Fleet', were found-to be resistant to biotype L and were tested to Hessian fly and the stem gall midge M. hordei Keiffer in Morocco. Because high temperature may affect the expression of resistance to Hessian fly, the temperature sensitivity of resistance to biotype L also was assessed at constant temperatures of 18, 24, and 30°C. Resistance tests demonstrated that Gwylan, WPBS 316/80, and Fleet were highly resistant to biotype L and Moroccan Hessian fly, but were susceptible to stem gall midge larvae. Resistance was expressed mainly as antibiosis, with 1st instars dying after feeding on resistant plants. Small numbers of larvae survived on resistant plants and appeared to develop normally, indicating that a tolerance mechanism also may be involved. Neither plant resistance nor the level of antibiosis expressed in the three cultivars was affected by increasing temperature up to 30°C. The results indicate that the New Zealand barleys carry resistance genes different than those previously identified in barley and would be excellent sources for breeding Hessian fly-resistant cultivars in the United States and Morocco.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Mayetiola destructor	Barley (Hordeum vulgare)	Morocco
	Mayetiola hordei	Barley (Hordeum vulgare)	Morocco