Damage byCylas formicariusFab. to sweet potato vines and tubers, and the effect of infestations on total yield in Papua New Guinea
作者:
J. A. Sutherland,
期刊:
Tropical Pest Management
(Taylor Available online 1986)
卷期:
Volume 32,
issue 4
页码: 316-323
ISSN:0143-6147
年代: 1986
DOI:10.1080/09670878609371085
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
In a series of four trials on sweet potato (Ipomoea batatas(L.) Lam.) four parameters relating to sweetpotato weevil(Cylas formicariusFab.) population and damage levels were recorded. These were the numbers of adult weevils per m2of foliage, the numbers of weevil life stages in 15 cm vine sections immediately above the tubers, the percentage of damaged vines and the percentage of damaged tubers. Strong positive correlations were found between the various parameters. Infestations of vines by weevils reduced the vigour of surface foliage and resulted in reduced yields. It was not possible to establish a spray threshold because reduced yields and damage to tubers occurred at low population levels. The number of rainy days between 60–90 days from planting was negatively correlated with the percentage of damaged tubers at 175 days from planting.
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