The infection moves up the root to the base of the stem causing the heart of the pineapple to rot. Results indicated that out of the seven pure cultures used for inoculation, five were pathogenic. The disease is of major importance in Malaysia but not as important as fruit collapse, caused by the same organism. The disease was first reported in Malaysia but has more recently been reported in Costa Rica (Chinchilla et al., 1979), Brazil (Melo et al, 1974), and the Philippines (K.G. Regional Universities Forum for Capacity Building in Agriculture, Pathogenicity of pineapple heart rot disease causal organisms in Central Uganda. The disease is more serious in the wet season and in acid soil. Yet, information on pineapple heart rot Pathogenicity of pineapple heart rot disease causal organisms in Central Uganda. Cultivar Smooth Cayenne recorded low severity and is therefore promising. Some features of this site may not work without it. The germs that cause the disease can survive in the soil for many years. Unlike Phytophthora heart rot, the young leaves remain firmly attached to the top of the stem. Causal organism: Phytopthora cinnamomi and Phytopthora parasitica. Incidence, severity and disease index were scored on each pineapple cultivar. Regional Universities Forum for Capacity Development in Agriculture (RUFORUM). By continuing you agree to the use of cookies. Currently, pineapple production in Uganda is being threatened by the outbreak of Pineapple heart rot disease (PHRD). However, there was significant difference (p < 0.001) in incidence of PHRD from week 6 up to week 12 of the experiment. Rohrbach, personal observation). Pineapple heart rot disease (PHRD) caused by Phytophthora nicotianae is a threat to pineapple industry in Uganda. Five cultivars of healthy pineapple suckers were planted in the field in a randomized complete block design (RCBD) to screen for resistance to PHRD. No significant (p > 0.05) difference in PHRD incidence was recorded in week two and week 4 of the experiment. Therefore, the objective of this study was to assess the reaction of pineapple cultivars to pineapple heart rot disease in central Uganda. Pineapple (Ananas comosus L. Merr) is an economic horticultural crop in Uganda. Cultivar smooth Cayenne recorded low disease severity and is recommended to farmers. However, pineapple production is currently being threatened by the latest outbreak of pineapple heart rot disease in Uganda. All the five pineapple cultivars were susceptible to PHRD though with varying levels of incidence and severity. Therefore, this study determined the pathogenicity of pineapple heart rot disease causal organisms from central Uganda. Pineapple (Ananas comosus (L.) Merr.) Ocwa, A., Bua, B., Tusiime, G., Oculi, J. Symptoms In the field, heart rot disease of young plants can be suspected where there is a change in the colour of leaves from normal green to yellowish green and browning of the leaf tips. However, the most common species of Phytophthora causing severe damages to pineapple in Uganda has been identified as P. nicotianae. Survival and spread. (2016). Yet, information on pineapple heart rot disease causal pathogen is unknown. Additionally, PHRD severity varied significantly (p < 0.001) from week 6 up to week 12. et al. Information on the sources of resistance is still scanty in Uganda. Symptoms In the field, heart rot disease of young plants can be suspected where there is a change in the colour of leaves from normal green to yellowish green and browning of the leaf tips. The disease is caused by a fungus-like organism known as a water mould. Pathogenicity of the pineapple heart rot causal organisms was assayed on green apple fruits and pineapple plants in the laboratory and the screen house. Pineapple heart rot disease is the most widespread and devastating disease of pineapple in Uganda and can cause tremendous yield loss. The genus Phytophthora, the causal organism of PHRD is a very destructive plant pathogen that attacks hundreds of plant species including pineapple throughout the world (Drenth and Guest, 2004). RUFORUM Working Document Series, 14 (2): 475 - 481. We use cookies to help provide and enhance our service and tailor content and ads. Ninety five percent (95%) of all inoculated plants developed heart rot disease symptoms and characteristics with the emergence being observed within 4-7 days and 9-20 days on green apples and pineapple plants, respectively. Reactions of pineapple cultivars to pineapple heart rot disease in central Uganda. https://doi.org/10.1016/j.cropro.2020.105213. Therefore, there is need for additional studies to establish the suitability of Smooth Cayenne as a source of parental donor in breeding for resistance to PHRD. All the five pineapple cultivars were susceptible to pineapple heart rot disease. © 2020 Elsevier Ltd. All rights reserved. Pathogenicity of the pineapple heart rot causal organisms was assayed on green apple fruits and pineapple plants in the laboratory and the screen house. Bacterial heart rot of pineapple is caused by the facultative anaerobe E. chrysanthemi Burkh. Pineapple (Ananas comosus L. Merrill) is one of the most important horticultural crops in many tropical and sub-tropical countries including Uganda. Information on the pathogenicity of the causal organisms in Uganda is still scanty. The disease can be spread through suckers. Copyright © 2020 Elsevier B.V. or its licensors or contributors. However, pineapple production in Uganda is threatened by the recent outbreaks of pineapple heart rot disease (PHRD). The fungus is important in the breakdown of pineapple residues after cropping and survives as chlamydospores in soil and decaying pineapple residues. is an important fruit crop in Uganda ranking third as a major fruit crop after banana and citrus globally. Infected plants can easily be broken off at ground level. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Five pineapple cultivars were planted in the pineapple heart rot disease hot spot. Additionally, no study has been done in Uganda which point out whether variety influences disease severity. Causal organism: Phytopthora cinnamomi and Phytopthora parasitica. JavaScript is disabled for your browser. Results indicated that out of the seven pure cultures used for inoculation, five were pathogenic. Therefore this study has proved that PHRD causal organisms in Uganda affect pineapple and the effect manifests within a short period of time. 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