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Abstract
Actinomycete i. a large heterogenou roup of microorgeuisms
comprising several f(JUlilie and uum ’ous species.The genus
Streptomyce wasco’ ed by (\ aksman and Henrtel 19~J) 10 dignme
certain aer bic saprophytic aerial mycelium producin actiuomycetes
from the rest’ of the geneI’ll f the order actinomyceale . from 1940 all
ward. microbiologist .uc reed d to observe thai actinomyeetes,
especially variou Streptomyces species are capable of producing
extremely valuable biologically active sub lances, of which the most
impol’lanr are antibiotics. enzyme vitamins and growth stimulators.
pigment and toxin - (Waksm3JJl, 1959 Kea H’nikov, 196”0 and
Lazzarlnl et al 20(0).
Potato Solanum tuberosum L.) i considered a on of Ole most
important vegetable crops in the Arab Republic of gy) I either for local
call. uniptiou or for exportation .Potato cultivated area wa 90289 feddans
and yielded 906038 Ions in 2004. Black scurf disease (causal pathogen
Rhizoctonia so/ani) i considered oue of the mo t eonuuon and widely
pread di eases of the potato all over’ lite world.
The present work is desienzed to develop a biological method 10
C ntrol black, scurf disease .. Streptomyces spp. were used as all effective
tool to produce IIJJ effective preparation. This biolosical preparation can
replaced the chemical which llla~r be used III this regard. The biological
preparation ’iVa al 0 rtudied regarding Ihe mo 1 effective do e. date and
number of applications.