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Accueil du site → Master → Etats Unis → 1979 → Resistance in alfalfa to the blue alfalfa aphid, Acyrthosiphon kondoi Shinji, in relation to environmental factors

University of Arizona (1979)

Resistance in alfalfa to the blue alfalfa aphid, Acyrthosiphon kondoi Shinji, in relation to environmental factors

Lowry, David William

Titre : Resistance in alfalfa to the blue alfalfa aphid, Acyrthosiphon kondoi Shinji, in relation to environmental factors

Auteur : Lowry, David William

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1979

Résumé
Resistance in alfalfa to the blue alfalfa aphid (BAA),

Acyrthosiphon kondoi Shin]i, was investigated in 24 experimental alfalfa polycrosses in three different environmental areas. Greenhouse9 caged ; field plot and open field plot tests showed well defined differences between resistant and susceptible experimentals. .Seedling alfalfa was. evaluated in greenhouse and caged field plot tests, whereas mature plants were evaluated in the open field plots » Greenhouse tests indi cated levels of resistance to BAA higher than CUF-101 were present in nine polycrosses - Resistant to moderately resistant entries were dis tinguished in seven experimentals and eight test entries were susceptible to BAA attack• Density independent factors were not.as influential in altering the expression of resistance as were density dependent f actors« The effect of light on photosynthetic rates as measured by specific leaf weight was not significant in relation to the expression of resistance. Temperature in the different experimental areas did not influence the expression of resistance or susceptibility. Aphid parasites were in fluential in decreasing aphid pressure on the experimentals in one greenhouse test and thus modifying resistance expression. Biomass production in greenhouse tests of uninfested seedlings was not corre lated with resistance of infested.seedlings,

Mots clés : Alfalfa — Disease and pest resistance. ; Blue alfalfa aphid.

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