CARACTERIZAÇÃO DE SINTOMAS E SINAIS DE HOSPEDEIROS DE Leandria momordicae

Abstract

Among vegetables, cucurbits are an important botanical family infected by Leandria momordicae, which has caused significant cucumber losses. The aim of this work is to characterize the symptoms and signs of L. momordicae hosts. Cucurbit leaves samples from January 2020 were collected, represented by (i) cucumber, ii) melon, iii) chayote, iv) pumpkin, v) “caxi”, vi) smooth luffa, and vii) gherkin. Symptoms initially recorded macroscopically were grouped and described. Then, using a stereoscopic microscope, the preparation of semi-permanent slides and direct isolation in potato-dextrose-agar culture medium were carried out. From the macro and microscopic images, the description of symptoms and isolates obtained directly from the host and in artificial culture medium was performed. The characterization of the isolates was carried out from the semi-permanent slides that were registered and measured (conidia diameter, mm). Symptoms of all hosts vary from polygonal (zoned spot), irregular, spherical lesions, with an aqueous halo on down face, and an expansive halo and confluent join necrotic lesions. Signs of all adult hyaline structures when young and mature only the multicellular, globose and muriform conidia turned dark (pheo). Of all the hosts, this is the first record of the occurrence of L. momordicae in loofah in the city of Urutaí.