Pest evaluation in sustainable cabbage production systems
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Published source details
Hoyt G.D. & Walgenbach J.F. (1995) Pest evaluation in sustainable cabbage production systems. HortScience, 30, 1046-1048.
Published source details Hoyt G.D. & Walgenbach J.F. (1995) Pest evaluation in sustainable cabbage production systems. HortScience, 30, 1046-1048.
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This study is summarised as evidence for the following.
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A randomised, replicated, controlled study in 1993 in North Carolina, USA (Hoyt & Walgenbach 1995) found greater weed biomass in organic (1,178-1,265 kg/ha) than conventional (213-422 kg/ha) plots of cabbage Brassica oleracea after harvest (27th August). Damage by moth and butterfly caterpillars (Lepidoptera) was similar between treatments. Damage caused by alternaria leaf spot Alternaria brassicae was lower in organic (score of 2.7) than conventional plots (score of 4) under standard tillage conditions, but was similar between organic and conventional strip-tilled plots (scores of 3.2-4.4). Disease damage was scored from 0 (no disease) to 5 (severe damage). Cabbage weight and the percentage of marketable cabbage heads were similar between organic (0.5-0.8 kg/head and 90-95%, respectively) and conventional (0.6-0.9 kg and 93-95%) plots. Four treatments (organic/standard tillage, organic/strip tillage, conventional/standard tillage, conventional/strip tillage) were tested in plots of 8 x 14 m, replicated four times. Organic plots received soybean Glycine max meal fertilizer and mechanical weed control. Conventional plots received chemical fertilizers and herbicides. All plots received Bacillus thuringiensis insecticide applications. Weed biomass was sampled from 1 mĀ² areas in the centre of plots. Twenty cabbage heads per treatment were examined for insect and disease damage at harvest.
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