Vol. 4, Issue 3 (2019)
Citrus wither tip (Colletotrichum gloeosporioides) is most prevalent disease in Sargodha and is the most important fungal disease contributing towards citrus decline in this area. During field surveyed, it was recorded that citrus wither tip was 100% prevalent in tehsil Kotmomin, Bhalwal and Silanwali and lowest was recorded in Shahpur while highest disease incidence was recorded in Kotmomin 42.22%, Sargodha 36.11%, Sahiwal 34.44%, Silanwali 36.11%, Bhalwal 32.22% and lowest in Shahpur 26.11%. The fungicides were evaluated using poisoned food technique at three concentrations 100, 200 and 300 ppm. The design used was completely randomized design with three replicates. Among all the fungicides, Topsin M was the most effective fungicide against all four isolates followed by Mancozeb+Matalaxyl and Aliette. Topsin M performed exceptional and its effect almost remained same against all the isolates tested. The second and third fungicides showed inhibitory effect against Isolate 2 were Success and Copper Oxychloride that percent inhibition was 22.22% at 7th day. Topsin M gave highest inhibition as compared to other fungicides against Isolate3 and its inhibition was 74.22% at 7th day. Meanwhile, Mancozeb+Matalaxyl showed good results against Isolate3 followed by Topsin M and its percent inhibition was 41.11%. Same trend has been observed in case of isolate 4 on which Topsin M gave highest inhibition as compared to other fungicides and its inhibition was 77.78%. The overall result revealed that that all tested concentrations of Topsin M were found significantly effective for controlling Colletotrichum gloeosporioides causes of citrus wither tip.
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