First report of citrus withertip (tip dieback), a disease complex caused by Colletotrichum siamense and Lasiodiplodia iraniensis, on Citrus reticulata cv. Kinnow in Punjab, Pakistan.
In 2014, a survey was conducted in three major citrus growing areas (Sargodha, Khushab, and Bhalwal) of Punjab province, where 94% of Pakistan's citrus production is concentrated. Severe dieback was observed in orchards, resulting in 40% yield losses. Dead twigs of Citrus reticulata cv. Kinnow produced small black pustules. Other symptoms included leaf chlorosis that eventually affected the whole plant. Morphological observations, multi-gene sequence analysis and pathogenicity tests revealed two causal agents, namely Colletotrichum siamense and L. iraniensis. This is thought to be the first report of a disease complex caused by Colletotrichum siamense and L. iraniensis, resulting in citrus withertip (tip dieback) in Punjab.