EFFECT OF BIOTIC AND ABIOTIC AGENTS IN CONTROLLING CUCUMBER LEAF SPOT CAUSED BY Alternaria cucumerina UNDER PROTECTED CULTIVATION

Document Type : Research articles.

Authors

1 Agric. And Pl. Path. Dept., Fac. Agric., Zagazig Univ.

2 Agric. Botany Dept., Fac. Agric., Fayoum Univ.

Abstract

Alternaria cucumerina was isolated from blighted or spotted
cucumber leaves. Pathogenicity test revealed that A. cucumerina was
pathogenic to cotyledons and true leaves of cucumber plants. Matrix
cv. gave the lowest infection with A. cucumerina, while Beta alpha
recorded the highest infection. On the otherhand, A. cucumerina
isolated from cucumber plants had ablility to infect other cucubit
plants; i.e. melon; watermelon; pumpkins, Smooth Loofah and
squash. Both Bacillus spp. and Trichoderma spp < /span>. inhibited the
growth of A. cucumerina either in vitro or in vivo. Trichoderma sp < /span>.,
T. harzianum, T. viride and different Bacillus spp < /span>. (isolated from
cucumber leaf surface) and their culture filtrates significantly
inhibited the radial growth of A. cucumerina on PDA medium.
Various concentrations of some plant oils and plant extracts reduced
the radial growth and spore germination of A. cucumerina, especially
clove oil. Also, Dithane M-45 was effective in reducing the radial
growth of A. cucumerina. Bacillus spp < /span>. (isolate 4), T. harzianum,
clove oil and Dithane M-45 were the most effective treatments in
controlling cucumber leaf spot.

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