New Zealand Plant Protection 2020-01-27T06:00:51+13:00 Dr Ruth Falshaw Open Journal Systems <p>ISSN 1175-9003 (print), ISSN 1179-352X (online)</p> <p><strong>2018 CiteScore</strong>: 0.68</p> <p><strong>Scope:</strong> Research on all aspects of biology, ecology and control of weeds, vertebrate and invertebrate pests, and pathogens and beneficial micro-organisms in agriculture, horticulture, forestry and natural ecosystems.</p> Symptom expression of Phytophthora colocasiae in inoculated taro corms 2020-01-27T06:00:51+13:00 Amy Maslen-Miller Robert A. Fullerton Angelika Tugaga Faalelei Tunupopo Seeseei Molimau-Samasoni Joanna K. Bowen Robin M. MacDiarmid Joy L. Tyson <p>Taro leaf blight (TLB), caused by <em>Phytophthora colocasiae</em>, is normally characterised by leaf lesions. There are isolated reports of <em>P. colocasiae</em> causing a corm rot but the symptoms are not well defined and have not been recorded in Samoa. Here we report on an inoculation method and describe the symptoms of corm rot caused by <em>P. colocasiae</em>. In this study, a corm inoculation method was developed in physical containment laboratories in New Zealand and subsequent symptom development studies were undertaken on TLB-tolerant taro cultivars in Apia, Samoa. The Samoan TLB-tolerant taro cultivars were able to be wound-infected with <em>P. colocasiae</em> and the results confirm previous descriptions of <em>P. colocasiae</em> infection giving rise to light brown firm rots in corms. This work has allowed the pictorial record of corm rots to be updated, potentially providing for better distinction between corm rots caused by <em>P. colocasiae</em> and those caused by other pathogens, such as <em>Fusarium</em> spp.</p> 2020-01-27T00:00:00+13:00 Copyright (c) 2020 New Zealand Plant Protection