PRINCIPAL COMPONENTS OF THE INTENSITY OF SQUAMOUS ROT ON PRICKLY PEAR PLANTATIONS IN THE SEMIARID REGION OF THE STATE OF PARAÍBA, BRAZIL¹

COMPONENTES PRINCIPAIS DE INTENSIDADE DA PODRIDÃO ESCAMOSA EM PALMA FORRAGEIRA ‘GIGANTE’ NO SEMIÁRIDO PARAIBANO

ABSTRACT

The aim of the present study was to identify fungal pathogens associated with prickly pear rot and the main components of squamous rot on plantations in the semiarid region of the state of Paraíba, Brazil. Pathogens were identified morphologically. The determination of the main components of squamous rot intensity was based on the incidence and severity of the disease. Fifteen genera of fungi were associated with rot, including Scytalidium sp., which was found on all plantations. The analyses indicated that relative humidity and rainfall favored the intensity of rot more than temperature. At least three pathogens were found to be associated with a high incidence of rot in prickly pear species in the semiarid region of the state of Paraíba, Brazil, but Scytalidium sp. was the most widely distributed. Moreover, the disease caused by this fungus intensifies and progresses under conditions of high humidity at moderate temperatures.

Keywords:
Opuntia ficus-indica; Progress of plant diseases; Epidemiology.