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Accueil du site → Master → Etats Unis → 1971 → Control of catclaw (Acacia greggii) with picloram in southern Arizona

University of Arizona (1971)

Control of catclaw (Acacia greggii) with picloram in southern Arizona

Metto, Paul Kimng’eny,

Titre : Control of catclaw (Acacia greggii) with picloram in southern Arizona

Auteur : Metto, Paul Kimng’eny,

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1971

Catclaw (Acacia greggii) in southern Arizona was treated with two rates of picloram + 2, 4, 5-T spray and granular picloram on 13 dates from August, 1969 to July, 1970. The foliar spray treatm ents at 1 and 3 lb. m ostly resulted in over 90% defoliation for all tre a t ment dates except in April and May. The granular treatm ents were not as effective as the liquid form ulation. The 1 lb. rate of beads caused high catclaw defoliation when applied in the sum m er of 1969, but the 1 lb. rate was less effective than the 3 lb. rate on all other dates. The granular treatm ents required precipitation following the treatm ent to show high response. Sum m er and fall treatm ent dates w ere found to be m ost effective. There was a severe but tem porary grass damage following application of both rates of the granular pic loram and the 3 lb. rate of the spray treatm ents. A bioassay method using lettuce seed shoot and root growth in petri dishes to determ ine picloram concentration was investigated. Good extraction of known quantities of picloram from the soil was achieved with potassium chloride. V ariability of extracts from field sam ples was large, and concentrations of sam ples tested w ere too dilute, to yield reliable data.


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