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Published in Crop Sci 20:790-792 (1980)
© 1980 Crop Science Society of America
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Influence of Alfalfa Bud Mite on Growth of Alfalfa under Different Temperatures1

P. M. Ridland and G. M. Halloran2

The influence of four temperatures (15, 20, 25, and 29 C) on the growth of alfalfa (Medicago sativa L) seedlings, initially infested with 10 alfalfa bud mites (Eriophyes medicaginis Keifer) per seedling, was studied.

Mite infestation caused significant reductions in dry weight of leaves and stems, petiole length, and leaf area of the seedlings at all temperatures. Dry weight reductions of infested seedlings were greatest at 25 and 29 C. The greatest reductions in stem and petiole length and leaf area occurred at 29 C. The reduction in total leaf area per plant due to mite infestation was similar at 15, 25 and 29 C but there was less reduction at 20 C.

The influence of bud mite infestation on the growth of alfalfa seedlings appears to be expressed mainly as a reduction of extension growth. This results in reduced leaf expansion and reduced elongation of the stem and petiole.

Key Words: Eriophyes medicaginis Keifer • Medicago sativa L.

1 Contribution from the Dep. of Plant Sciences, School of Agriculture and Forestry, Uuiv. of Melbourne, Australia.

2 Former postgraduate student (currently entomologist, Plant Research Institute, Burnley, Victoria, 3121, Australia) and senior lecturer, School of Agriculture and Forestry, Univ. of Melbourne, Parkville, Victoria, 3052, Australia.

Received for publication November 5, 1979.




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