Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 422683
Title Interrelations between citrus rust mite, Hirsutella thompsonii and greasy spot on citrus in Surinam
Author(s) Brussel, E.W. van
Source Landbouwhogeschool Wageningen. Promotor(en): J. de Wilde, co-promotor(en): J.B.M. van Dinther. - Wageningen : Centre for Agricultural Publishing and Documentation - ISBN 9789022005750 - 66
Department(s) Wageningen University
Publication type Dissertation, internally prepared
Publication year 1975
Keyword(s) citrusfruit - plantenziekten - afwijkingen, planten - plantenziektekunde - plantenplagen - gewasbescherming - suriname - citrus fruits - plant diseases - plant disorders - plant pathology - plant pests - plant protection
Categories Diseases, Pests and Disorders of Plants (General) / Citrus Fruits
Abstract Counts of citrus rust mite <em>(Phyllocoptruta oleivora</em> (Ashm.)) on leaves and fruit of citrus rose to a peak in the two dry seasons, the build up taking 4-5 weeks. It then decreased partly through infection by the entomogenous fungus <em>Hirsutella</em><em>thompsonii</em> Fisher and partly through a decline in feed quality. The low counts in the wet seasons were associated with rain rather than humidity, temperature or infections by <em>H. thompsonii.</em> Spraying with suspensions of fragmented mycelium of <em>H. thompsonii</em> (mass concentration 0.5-1.0 g litre <sup><font size="-1">-1</font></SUP>) prevented the build up of citrus rust mite.<p/>The severity of greasy spot <em>(Stenella</em> sp.) was positively correlated with counts of citrus rust mite. Defoliation of citrus trees after greasy spot infection was associated with high counts of mite.<p/>Control of citrus rust mite (with chlorobenzilate: mass concentration of a.i. 2 g litre <sup><font size="-1">-1</font></SUP>at 500 litre ha <sup><font size="-1">-1</font></SUP>) was warranted when 25% of fruit or 15% of leaves bore at least one mite per lens field (1.5 cm <sup><font size="-1">2</font></SUP>). Greasy spot could be controlled by preventing build-ups of citrus rust mite.
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