Interrelations between citrus rust mite, Hirsutella thompsonii and greasy spot on citrus in Surinam

E.W. van Brussel

Research output: Thesisinternal PhD, WU

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.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
Supervisors/Advisors
  • de Wilde, J., Promotor, External person
  • van Dinther, J.B.M., Co-promotor, External person
Award date18 Sep 1975
Place of PublicationWageningen
Publisher
Print ISBNs9789022005750
Publication statusPublished - 1975

Keywords

  • citrus fruits
  • plant diseases
  • plant disorders
  • plant pathology
  • plant pests
  • plant protection
  • suriname

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