Vol. 11, Issue 12 (2022)

Investigation on leaf spot disease (Alternaria cucumeria var. cymopsidis. of guar (Cymopsis tetragonoloba (L) Taub) under M.P. condition was carried out to find suitable management strategies. The hazardous effects of chemicals used in plant disease management have diverted plant pathologists to find out an effective alternative method with little or no adverse effect on environment. The results revealed that all the phytoextracts tested were significantly superior over the control in checking the growth of the pathogen. The rhizome extract of ginger (54.42%) was found significantly superior in inhibiting mycelial growth over the rest. The next best in order of merit was garlic with 80.88% inhibition at all concentrations followed by aak with 64.29%, onion with 61.49%, Neem with 60.54%, cow urine with 58.48%, deshi bavul 54.71%, eucalyptus with 54.34%, mustard oil with 49.57%, castor oil with 42.97%, Lantana camera with 41.62%, vermi wash with 34.59%, and tulsi was the least effective. (50.67%). The sporulation was inhibited by all the phyto extracts as compared to control. Thus, extract of Garlic, Aak, onion, Neem, Deshi bavul, Eucalyptus and Lantana camera proved most effective phytoextracts in inhibiting mycelial growth as well as in preventing spore formation.