Abstract:
An investigation was undertaken to find out the effect of five fungicides, three plant extracts and a
bioagent on the incidence and severity of dieback of citrus caused by Colletotrichum
gloeosporioides. Five fungicides namely Dithane M45 (0.3%), Ridomil MZ-72 (0.2%), Bavistin
50 WP (0.1 %), Champion 77 WP (0.25%) and Bordeaux mixture (I %), three plant extracts viz.
Bishkatali (Polygonum hydropiper) leaf extract, Garlic (Allium sativum) clove extract and Neem
(Azadirachta indica) leaf extract and one bioagent (Trichoderma harzianum T,,) were tested as
foliar spray for six times to control the disease. The highest reduction of dieback severity (PDI)
was obtained with Dithane M45 (73.46%), which was followed by Neem extract (67.34%),
Bordeaux mixture (59.19%) and Trichoderma harzianum T2l (57.67%).
