Studies on wilt disease of Guava (Psidium guajava L.)

Pathogenic fungus Fusarium oxysporum f. sp. psidii were isolated from different areas of Aligarh from diseased plants & rhizospheric soil. The max. radial growth of F. oxysporum f. sp. psidii was found at temp. 25ºC. Among all biofungicides (T. harzianum, T. virens, T. viride A. niger & P. flourescens) used against pathogen in dual inoculation test,the maximum growth inhibition was recorded with T. viride 75%. Effects of volatile compounds produced by T. harzianum were seen on the growth of the pathogen & found that 2 days of incubation with T. harzianum gave a max. growth inhibition of 76.5% followed by 4, 6, 8 and 10 days of incubation with 63.6 %, 50.0% 36.4%, 23.6% of inhibition. Among ten plant extracts max. 56.46% growth inhibition of pathogen was recorded with Azadirachta indica. Highest increase in shoot length 20% & root length 28.5% were recorded with P. flourescens & dry weight of shoot 21% and root 24.5% with A. niger in comparison to uninoculated control pots,were as max. increase in shoot length 19%, root length 25%,dry weight of shoot 22% & dry weight of root 23% were recorded with T. viride in comparison to inoculated (Fusarium. oxysporum f. sp. psidii)control pots.

Autorentext

Dr Asma Naz is a graduate of de'Montmorency College of Dentistry, Lahore, Pakistan. She did her fellowship in Prosthodontics in the year 2012. She takes keen interest in dealing with multidisciplinary rehabilitative cases of the stomatognathic system. Currently she is working as an Assistant Professor in a prestigious dental institute of Karachi.