Extracts of T. erecta prepared from root, stem or whole
plants and applied to the rhizosphere of L. esculentum
plants at 10 and 25 DAT significantly reduced nematode
populations in soil 90 DAT (ANOVA, F ¼ 11:25,
P ¼ 0:001) compared to untreated, infested check although
only whole plant extracts prepared from either 40 or 70-
day old T. erecta reduced M. incognita populations to the
level achieved with carbofuran (Table 2). Nevertheless, all
T. erecta extracts yielded root gall indexes that were
significantly lower than infested checks and were comparable with carbofuran (ANOVA, F ¼ 7:09, P ¼ 0:0006).
These differences were reflected in fruit yield, up to 90
DAT, with all plants treated with T. erecta extracts yielding
significantly more fruit than the infested checks (ANOVA,
F ¼ 12:36, P ¼ 0:0001) and were comparable with carbofuran, apart from the fruit yield of plants treated with T.
erecta root extract prepared from 70-day old T. erecta
plant material which was not significantly different from
the infested check (Table 2).