Evaluation of field trials with colletotrichum gloeosporioides for the biological control of hakea sericea

Morris, M.J.

Phytophylactica 15(1): 13-16

1983


Accession: 005398313

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Abstract
Studies were made to determine conditions favoring infection of the invasive weed H. sericea by C. gloeosporioides and to evaluate inoculation methods. Spores of the fungus germinated over a wide temperature range but required 95% relative humidity or above for germination. They lost their viability within 1-2 days on leaves exposed out-of-doors. C. gloeosporioides infected succulent, expanding leaves but very young leaves, fully expanded leaves and leaves on dormant shoot tips were not infected. Disease also developed on flowers and young fruits. Plants were susceptible to stem wound inoculation throughout the year but disease development was most rapid on plants inoculated March-July. Suggested methods of introducing C. gloeosporioides into stands of H. sericea to encourage biological control are by spraying plants with a spore suspension during growth flushes coinciding with periods of mist or rain early in the 2nd half of the year, or by inoculation after stem wounding between March and July.