Abstract
In order to evaluate the plant extract effect on the in vitro growth of Fusarium solani and Phoma tarda, hexane crude extract from spiny holdback (Caesalpinia spinosa) leaflets was obtained and incorporated into potato-dextrose-agar (PDA) at 2204 mg L-1, 4460 mg L-1, 6370 mg L-1, 7644 mg L-1 and 16179 mg L-1 concentrations. The hexane crude extract inhibited mycelial growth at the range of 3,95% to 32,20% of P. tarda and 7,29% to 33,83% of F. solani, according to the extract concentration. It was demonstrated that the extract has antifungal activity and might be an alternative to physical or chemical control methods of fusariosis disease in several cultivations and of Phoma spot on coffee plant leaf
Highlights
Biological control has been widely and successfully used to control plant diseases
It was observed that the hexane extract had partial inhibitory effect against F. solani and P. tarda (Table 1)
There was significant difference among the mycelial growth averages of F. solani obtained with different dosages of hexane extract
Summary
Wilson (1998) defines "biological control of plant diseases" as the control of a disease through a natural biological process or with the product of a natural biological process According to this broad definition, chemicals used in biocontrol could be extracted from living biological organisms or produced by living organisms. Biological control under this definition would be clearly distinguishable from physical control and from synthetic chemical control of plant diseases. These diseases cause great losses in important agricultural crops.
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