ALLELOPATHIC EFFECT OF WITCH’S BROOM (Moniliophthora perniciosa Stahel.) INOCULATED IN SEVEN SPECIES OF WEEDS

Abstract

The study was to evaluate the effect of aqueous extract of cocoa branches ethanolic extract healthy and infected branches Moniliophthora perniciosa Stahel fungus on the foliage of seven weed (five-leaved and two narrow leaf). The percentage of necrosis on leaves was determined based on a nominal scale (0-7). To narrow leaf weeds the best treatment T6 at day 15 showed a severity of 4.38% at day 30 this value drops to 4.27% at day 45 finally give a value of 3.44%, although the plant in the early days has high severity, this resistance gets each passing day trial, also the day 15 T2 has a 4.24% severity increasing to 30 days 4.31%, but at 45 days this value decreases to 4.16%. For broadleaves the best treatment for the first 15 days was 4.05% Q1 this value down to 4.01% 30 days and maintained until day 45, and the severity thereof within 15 days for T3 (3.90%) and T5 (4.01), then at 30 days increased slightly T3 (3.93%) and T5 (4.06), but at 45 days decreased T3 (3.88%) and T5 (3.25), in both broadleaf and narrow is assumes the first day plant is not able to resist the attack caused by the extracts, but from day 30 and 45, and this resistance obtained is posible recovered by chemotaxonomic and physiological mechanisms.