Abstract
Fusarium wilt disease attacks the tomato plants, and Solanaceae plants with losses can reach 90 %. Thus, this disease was tough to control. The morphology and pathogenicity variation caused failure disease control. Both variations could be affected by the altitude of the planting site. Therefore, it also required special handling of management as well. The specific objectives of this study to investigate the Fusarium isolate from different altitude response of physical properties (acid-base pH, low-high temperature, and fungicides of other active ingredients) and growth rate of Fusarium. All Fusarium sp. were isolated from the leaves, soil, roots, and stem of infected tomato plants. Before a series of tests were carried out, all of the isolates were tested for pathogenicity, then tested for the influence of abiotic factors. This study obtained four isolates from high altitude, four isolates from medium altitude, and five lowland isolates. In morphological observations, there were striking differences in colony color and growth rate among isolates on several media and pathogenicity tests. Each isolate had different pathogenicity, although from the same location but other parts of the plant. Knowing the characteristic morphology and Fusarium sp. response of the three areas can be used as references in controlling.
Highlights
Fusarium oxysporum f. sp. lycopersici (Sacc.) W.C
This research was a follow-up from previous research controlling Fusarium sp., a wilt disease on tomato plants
Fusarium sp. isolates obtained from the isolation of the three regions that have different altitudes, at low (140 m to 200 m above sea level, m asl), medium (678 m asl to 700 m asl), and high altitudes (1 100 m asl to 1 200 m asl)
Summary
Fusarium oxysporum f. sp. lycopersici (Sacc.) W.C. Snyder and H.N. Fusarium is an economically very important species because it causes wilt and root rot disease in some plants [2]. Tyagi 2014 [11] studied the effect of temperature on growth and sporulation of F. oxysporum f. This research was a follow-up from previous research controlling Fusarium sp., a wilt disease on tomato plants. From the previous research result, Fusarium oxysporum isolates of the same low altitudes site plant, but different plant parts had the same character of shape and size of spore, but growth characteristics were different, as well as pathogenicity and virulence. It is difficult to control the disease [14] It needs to be revealed more about the difference of isolated characters from many altitudes
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