is an important fruit crop in Uganda ranking third as a major fruit crop after banana and citrus globally. Reactions of pineapple cultivars to pineapple heart rot disease in central Uganda. 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. The disease is caused by a fungus-like organism known as a water mould. Regional Universities Forum for Capacity Building in Agriculture, Pathogenicity of pineapple heart rot disease causal organisms in Central Uganda. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. 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. 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). Pineapple heart rot disease (PHRD) caused by Phytophthora nicotianae is a threat to pineapple industry in Uganda. The infection moves up the root to the base of the stem causing the heart of the pineapple to rot. 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. Pathogenicity of the pineapple heart rot causal organisms was assayed on green apple fruits and pineapple plants in the laboratory and the screen house. The fungus is important in the breakdown of pineapple residues after cropping and survives as chlamydospores in soil and decaying pineapple residues. Ocwa, A., Bua, B., Tusiime, G., Oculi, J. Incidence, severity and disease index were scored on each pineapple cultivar. No significant (p > 0.05) difference in PHRD incidence was recorded in week two and week 4 of the experiment. RUFORUM Working Document Series, 14 (2): 475 - 481. The disease is of major importance in Malaysia but not as important as fruit collapse, caused by the same organism. Therefore, the objective of this study was to assess the reaction of pineapple cultivars to pineapple heart rot disease in central Uganda. Currently, there is uncertainty in the management of the disease. However, the most common species of Phytophthora causing severe damages to pineapple in Uganda has been identified as P. nicotianae. All the five pineapple cultivars were susceptible to pineapple heart rot disease. Causal organism: Phytopthora cinnamomi and Phytopthora parasitica. Regional Universities Forum for Capacity Development in Agriculture (RUFORUM). Pathogenicity of pineapple heart rot disease causal organisms in Central Uganda. Pathogenicity of the pineapple heart rot causal organisms was assayed on green apple fruits and pineapple plants in the laboratory and the screen house. Causal organism: Phytopthora cinnamomi and Phytopthora parasitica. Additionally, PHRD severity varied significantly (p < 0.001) from week 6 up to week 12. However, pineapple production in Uganda is threatened by the recent outbreaks of pineapple heart rot disease (PHRD). Results indicated that out of the seven pure cultures used for inoculation, five were pathogenic. JavaScript is disabled for your browser. Bacterial heart rot of pineapple is caused by the facultative anaerobe E. chrysanthemi Burkh. Rohrbach, personal observation). Survival and spread. Yet, information on pineapple heart rot disease causal pathogen is unknown. Five cultivars of healthy pineapple suckers were planted in the field in a randomized complete block design (RCBD) to screen for resistance to PHRD. et al. Cultivar Smooth Cayenne recorded low severity and is therefore promising. However, pineapple production is currently being threatened by the latest outbreak of pineapple heart rot disease in Uganda. Pineapple (Ananas comosus (L.) Merr.) The germs that cause the disease can survive in the soil for many years. Cultivar smooth Cayenne recorded low disease severity and is recommended to farmers. The disease is more serious in the wet season and in acid soil. By continuing you agree to the use of cookies. Pineapple (Ananas comosus L. Merrill) is one of the most important horticultural crops in many tropical and sub-tropical countries including Uganda. Pineapple heart rot disease is the most widespread and devastating disease of pineapple in Uganda and can cause tremendous yield loss. Information on the pathogenicity of the causal organisms in Uganda is still scanty. Infected plants can easily be broken off at ground level. Results indicated that out of the seven pure cultures used for inoculation, five were pathogenic. However, there was significant difference (p < 0.001) in incidence of PHRD from week 6 up to week 12 of the experiment. We use cookies to help provide and enhance our service and tailor content and ads. Information on the sources of resistance is still scanty in Uganda. Unlike Phytophthora heart rot, the young leaves remain firmly attached to the top of the stem. Pineapple (Ananas comosus L. Merr) is an economic horticultural crop in Uganda. … https://doi.org/10.1016/j.cropro.2020.105213. 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. Currently, pineapple production in Uganda is being threatened by the outbreak of Pineapple heart rot disease (PHRD). Therefore this study has proved that PHRD causal organisms in Uganda affect pineapple and the effect manifests within a short period of time. Additionally, no study has been done in Uganda which point out whether variety influences disease severity. 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 can be spread through suckers. Yet, information on pineapple heart rot Copyright © 2020 Elsevier B.V. or its licensors or contributors. (2016). 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. Five pineapple cultivars were planted in the pineapple heart rot disease hot spot. 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