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Effect of Foliar Applications of Fungicides on the Phylloplane Mycoflora and Fungal Pathogens of Guava
Author(s) -
Pandey R. R.
Publication year - 1988
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1988.tb01036.x
Subject(s) - fungicide , biology , benomyl , mancozeb , captan , phyllosphere , horticulture , population , spore germination , botany , germination , toxicology , bacteria , genetics , demography , sociology
Colletotrichum gloeosporioides and Pestalotia psidii were found to be the dominant pathogens causing leaf spots and fruit diseases of guava. Effects of two fungicides in rainy (wet) and four fungicides in the winter (dry and cool) seasons separately, in concentrations of 500, 1500 and 3000 mg a.i. I −1 (ppm) have been investigated on the pathogens and on composite phylloplane fungi. Benomyl was found most effective against the population of pathogens and checked disease development. However, it was effective only at the schedule of three successive foliar applications. The application of captan did not check P. psidii as effectively as benomyl but it had a marked adverse effect on many of the phylloplane fungi. A signif, icant decrease in the number of fungal species colonizing mancozeb and dichlone‐treated leaves was observed. Lesion measurement and spore germination tests against both pathogens following chemical treatments in vivo and in vitro respectively have also been made.