Multiple choice Which of the following pairs is incorrect? Blight of cassava - Xanthomonas axonopodis Wilt of carnation - Erwinia tracheiphila Black wood of grapewine - Phytoplasma Blight of cotton - Xanthomonas citri Reveal answer Fill a bubble to check yourself B Correct answer Explanation Erwinia tracheiphila causes wilt of cucurbitaceae. Wilt of carnation is caused by Burkholderia caryophylli.