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The inhibitory effect of seedling grasses on feeding and survival of Acridids (Orthoptera)

Published online by Cambridge University Press:  10 July 2009

E. A. Bernays ,
R. F. Chapman ,
J. Horsey  and
E. M. Leather
E. A. Bernays
Affiliation:
Centre for Overseas Pest Research, College House, Wrights Lane, London W8 5SJ
R. F. Chapman
Affiliation:
Centre for Overseas Pest Research, College House, Wrights Lane, London W8 5SJ
J. Horsey
Affiliation:
Centre for Overseas Pest Research, College House, Wrights Lane, London W8 5SJ
E. M. Leather
Affiliation:
Centre for Overseas Pest Research, College House, Wrights Lane, London W8 5SJ
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Abstract

The amounts eaten by Locusta migratoria migratorioides (R. & F.) on seedling grasses was less than on mature grasses in four other Acridids, Nomadacris septemfasciata (Serv.), Chortoicetes terminifera (Wlk.), Melanoplus sanguinipes (F.) and Schistocerca gregaria (Forsk.). Palatability of the young grasses increases with age, becoming maximal 6–10 weeks from the time of germination. Similar preferences were shown by other Acridids. Time-lapse film studies on Locusta showed that not only is less time spent feeding on seedling grasses, but that locomotor activity levels are considerably higher. Survival studies on the same species showed higher mortality on the seedlings as compared with the mature leaves at all stages of nymphal development, while on seedlings no individuals survived to the adult stage. Lipid-soluble materials were removed from seedling leaves with chloroform or acetone and this rendered them more acceptable, while the extract applied to mature leaves resulted in reduced palatability.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 64 , Issue 3 , November 1974 , pp. 413 - 420
Copyright
Copyright © Cambridge University Press 1974

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