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EFFECT OF THE PEA APHID, ACYRTHOSIPHON PISUM (HEMIPTERA (HOMOPTERA): APHIDIDAE), ON YIELD AND QUALITY OF FORAGE ALFALFA

Published online by Cambridge University Press:  31 May 2012

A. M. Harper  and
M. S. Kaldy
A. M. Harper
Affiliation:
Research Station, Agriculture Canada, Lethbridge, Alberta T1J 4B1
M. S. Kaldy
Affiliation:
Research Station, Agriculture Canada, Lethbridge, Alberta T1J 4B1
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Abstract

The pea aphid, Acyrthosiphon pisum (Harris), affected yield by significantly reducing the mean height of aphid-susceptible Grimm alfalfa in a greenhouse experiment by 45%, the height of the longest stem by 35%, the green weight by 38%, the dry weight by 44%, and the fiber by 13%. There was limited change in quality of alfalfa. The percentages of protein, fat, total sugar, reducing sugar, dry matter, and nitrogen-free extract were not significantly different in the infested and non-infested alfalfa. Potassium was significantly lower in the infested plants but they contained more calcium, magnesium, and phosphorus. With the exception of isoleucine the amino acid composition was similar in the infested and non-infested alfalfa.

Résumé

Le puceron du pois, Acyrthosiphon pisum (Harris), a nui au rendement en réduisant significativement de 45% la taille moyenne du cultivar de luzerne Grimm sensible dans une expérience en serre, de 35% la hauteur de la tige la plus longue, de 38% le poids humide, de 44% le poids sec et de 13% la teneur cellulosique. Mais ces dégâts ont peu influé sur la qualité de la récolte. Les teneurs relatives en protéines, matières grasses, sucres totaux, sucres réducteurs, matière sèche et extraits non azotés ne diffèrent pas significativement chez la luzerne infestée et non infestée. La teneur en potassium est significativement plus faible chez les plants infestés, mais ceux-ci contiennent en revanche plus de calcium, de magnésium et de phosphore. À l'exception de l'isoleucine, la composition acido-aminée est semblable chez la luzerne infestée et non infestée.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 6 , June 1982 , pp. 485 - 489
Copyright
Copyright © Entomological Society of Canada 1982

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