Soil drench with zoospore suspension of P. nicotianae or BABA inhibits
P. capsici in C. annuum
Three cultivars of C. annuum, (Camelot, NM-64, and Jupiter) were soil drenched with a suspension
of 100,000 P. nicotianae zoospores, 2.5 mM BABA, or water, and subsequently foliar
inoculated with a suspension of 2,000 zoospores of P. capsici per leaf. At 48 h post inoculation
with P. capsici, all plants developed localized foliar symptoms consistent with a susceptible P.
capsici / C. annuum interaction, with no visible differences among treatments (data not
shown). At two weeks post inoculation with P. capsici, significant differences in disease progression
were visible between treated and untreated plants (Fig 3). For the three C. annuum
cultivars evaluated, P. capsici strain PWB 24 caused systemic foliar blight and death in all untreated
plants, whereas 50%- 83% of plants treated with P. nicotianae or BABA did not develop