Effect of Temperature, Relative Humidity and pH on Mycelial Growth and Sporulation of Fusarium pallidoroseum Causing Fruit Rot of Kachari (Cucumis callosus)

By : R G Jat, R P Ghasolia, Rekha Kumawat

Page No: 91-93

Abstract
Kachari (Cucumis callosus), having English name cucumber pubacent is a warm season annual crop which grown as wild or cultivated at a large scale with bajra, moth, moong and guar in arid and semi arid regions of Rajasthan. It requires 250 C temperature for seed germination and 30-350 C for growth and development. During survey, kachari fruits were found infected with Fusarium rot caused by Fusarium pallidoroseum causing severe damage at maturity stage both in quantitatively and qualitatively in the field of Jobner vicinity during Kharif season 2009. The effect of different levels of temperature (15, 20, 25, 30 and 350 C), relative humidity (60, 70, 80, 90 and 100 percent) and pH (5.5, 6.0, 6.5, 7.0, 7.5, 8.0 and 8.5) on growth and sporulation of the pathogen were tested in vitro conditions. Maximum mycelial growth and sporulation were found at 250 C temperature (85.30 mm), 100 per cent relative humidity (89.15 mm) and maximum dry mycelial weight at 6.5 pH (275g).

Authors :
Rekha Kumawat , R G Jat and R P Ghasolia : Department of Plant Pathology, S.K.N. College of Agriculture, Jobner 303329 (Jaipur), India