Assessment of root knot nematodes (meloidogyne spp.) preferences to commonly grown tomato varieties in Mvomero district

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Sokoine University of Agriculture


Root-knot nematodes (RKN) are among serious biotic constraints to tomato growers in Tanzania but relatively overlooked. This necessitated to conduct a survey to capture pre- existing knowledge of growers on RKN in Mvomero Disrict, Morogoro, Tanzania. Multistage sampling procedure was used to obtain respondents for interiew. Semi- structured questionnaires were used to collect data from 100 randomly selected respondents in Mlali (33), Doma (33) and Dakawa (34). Data were collected on socio- economic status, awareness of respondents on RKN, tomato varieties grown, seed sources and yield. Results indicate that there was a significant variation (p = 0.01) in awareness on RKN across categories of respondents. However, 59% of respondents were not aware of RKN. There was a significant correlation between farming experience and yield of tomato (p < 0.001), Farming experience and awareness of RKN (p < 0.001) and between yield and knowledge on RKN resistant tomato varieties (p < 0.008). Popular tomato varieties grown by farmers were Rio Grande (14%), Cal J (18%), Roma (10%) and Tanya (16%) while hybrids were Imara F1 (19%), Assila F1 (15%), Jarrah F1 (2%), Zara F1 (3%), Kipato F1 (2%) and Anna F1 (2%). Seventy five root and 75 soil samples of tomato plants at flowering/fruiting stage showing stunting, chlorosis and wilting signs were collected from fields located at least 1km apart in Mlali, Doma and Dakawa. Samples were collected about 25 cm deep using a shovel, packed in sterile plastic bags, labelled and transported to TARI Kibaha Nematology laboratory for RKN analysis. Results revealed the significant prevalence (p = 0.002) and incidence (p < 0.001) of RKN. Despite the occurrence and damage caused by RKN in tomato in the study areas, only one percent of respondents recognised RKN as a serious problem. Awareness campaign on RKN will facilitate farmers’ consciousness of their existence and management.




Meloidogyne spp, Mvomero, Tomato genotypes, Root Knot Nematodes