Infectivity of conidium and mycelium of Leandria momordicae

Abstract

The available information on the epidemiology of net spot induced by Leandria momordicae Rangel
in Cucumis sativus is contradictory. Due to the lack of a precise information and the difference between symptoms during summer and fall, it was evaluated the mycelium infectivity under appropriate and inappropriate conditions to infect, and the viability of spores from lesions of both seasons. It was observed that the mycelium could infect
under appropriate and under inappropriate temperature under relative moisture conditions for conidium infection. Spores from lesions occurring in the summer were unable to infect, as opposed to those from lesions produced in
the fall, both under natural and moisture chamber conditions. Therefore, due to the fact that the fungus infection either by mycelium or by conidium depends on the environmental conditions, it was concluded that it can infect and survive on its hosts during the whole year. Taking into account the mycelium infectivity, it can be used as inoculum, and its presence must be considered in conidium suspensions addressed to inoculations in plant
resistance and susceptibility assays.