Effect of rust on the efficacy of foliar applied herbicides on rubber vine

Vitelli, Joseph, and Madigan, Barbara (2000) Effect of rust on the efficacy of foliar applied herbicides on rubber vine. In: Papers and Proceedings of the Australian Weeds Conference. pp. 238-241. From: 12th Australian Weeds Conference: weed management into the 21st century: do we know where we're going?, 12-16 September 1999, Hobart, Tasmania.

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Two herbicides (triclopyr/picloram (Grazon DS™) at 1.05/0.35 g a.i./L, and metsulfuron (Brushoff TM) at 0.09 g a.i./L) were foliar applied to mature rubber vine (Cryptostegia grandiflora) plants growing in the field. Sprayed plants were infested with varying degrees (light, medium, and heavy) of rust (Maravalia cryptostegiae). Effective control of rubber vine can be achieved by a number of methods, alone or in combination depending on the situation and the severity of the infestation. For optimum results when applying foliar herbicides (ground or aerially) to rubber vine, the plant needs to be uniformly lush, actively growing, and flowering. As plants become water stressed or defoliated, mortality from applied herbicides decreases. Two biocontrol agents (rust and moth (Euclasta gigantalis)) released by the Department of Natural Resources in Queensland are successfully established in the field. Both agents cause defoliation and fail to kill established rubber vine plants. The efficacy of foliar applied herbicides triclopyr/picloram and metsulfuron were significantly (P<0.05) affected by rust when compared to plants without rust. As rust infection level increased from light to heavy, plant mortality decreased, 65 to 41% respectively. Triclopyr/picloram application killed more rubber vine plants (77%) than metsulfuron (53%). (Data from previous herbicide trials was used for plants with no rust, as all rubber vine in the field experiment was infected with rust to some degree.) High volume spraying of plants with a heavy rust infection level caused 10 to 15% defoliation during herbicide application. Ground and aerially applied foliar herbicides must only be applied to rubber vine when the plants have little or no rust. Plants with a light rust infection level should be treated with triclopyr/picloram in preference to metsulfuron. Additives that will increase the efficacy on rust infected plants need to be evaluated. Until then alternative control options need to be selected for plants with a medium to high rust infection level.

Item ID: 27488
Item Type: Conference Item (Research - E1)
Date Deposited: 05 Jun 2013 23:04
FoR Codes: 06 BIOLOGICAL SCIENCES > 0607 Plant Biology > 060799 Plant Biology not elsewhere classified @ 100%
SEO Codes: 96 ENVIRONMENT > 9604 Control of Pests, Diseases and Exotic Species > 960410 Control of Pests, Diseases and Exotic Species in Sparseland, Permanent Grassland and Arid Zone Environments @ 100%
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