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Economic threshold of grey field slug, Deroceras reticulatum Muller (Gastropoda: Agriolimacidae) on Chinese cabbage in greenhouse
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/290451
Grey field slug, Deroceras reticulatum Muller, is one of the major pests of chinese cabbage, Brassica campestris. To determine the economic thresholds of grey field slug on chinese cabbage, the slugs were inoculated after planting 1 week into chinese cabbages with a density of 0, 2, 4, 8, 16 slugs per 16 chinese cabbages(1㎡) at the plastic house in the spring and autumn of 2008. The rates of damaged cabbages by slug inoculation were 10.7% at 2 slugs and 42.7% at 16 slugs in the spring, and 20.3% at 2 slugs and 59.2% at 16 slugs in the autumn. The linear relationships between the initial slugs density and yield reduction of chinese cabbage were as following ; Y = 286.07x + 548.62, R2=0.9524(in the spring cultivation), Y = 318.91x + 998.05, R2=0.9323(in the autumn cultivation). Based on these results, the economic threshold of grey field slug per 16 chinese cabbages(1㎡) was 2.52 slugs in the spring and 0.86 slugs in the autumn.
