Abstract:
Tomato (Solanum lycopersicum L.) production in Tanzania is affected by late blight disease caused
by Phytophthora infestans (Mont.) de Bary. Currently, farmers spray more than 12 per crop per season to control diseases by weekly spraying. Field experiments were conducted at Morogoro to
evaluate the performance of three tomato varieties subjected to different fungicide chemistries and
reduced fungicide spray intervals. The treatment factors were tomato varieties Meru, Cal-J and
Tanya as main plots; fungicides Ivory 72 WP, Volar MZ 690 WP and Topsin-M 70 WP as sub plots;
and reduced number (4, 6, 8 and no-spray) of sprays per crop at a spray intervals of 14-, 10-, 7-days respectively as sub-sub plots