Agrochemical Inhibition of Phytophthora cinnamomi in Pineapples | InformativeBD

E. M. Ilondu,  and G. O. Ibuzor,  from the different institute of the Nigeria. wrote a research article about, Agrochemical Inhibition of Phytophthora cinnamomi in Pineapples. entitled, Inhibitory efficacy of some agrochemicals on mycelial growth of Phytophthora cinnamomi isolated from heart-rot disease of pineapple (Ananas cosmosus (L.) Merr.). This research paper published by the International journal of Microbiology and Mycology (IJMM). an open access scholarly research journal on Microbiology. under the affiliation of the International Network For Natural Sciences | NNSpub. an open access multidisciplinary research journal publisher.

Abstract

Some agrochemicals have been tested and found effective in plant disease control to improve food security. Growth inhibitory efficacy of four agrochemicals against Phytophthoracinnamomi isolated from heart-rot disease of pineapple (Ananas comosus) in naturally infested farm at Site I of Delta State University, Abraka was evaluated using poisoned food technique. The fungicides (fungu-force, mancozeb, maneb and mackecknie gold) at the concentrations of 25 -5000 ppm were evaluated ­in-vitro for their effect on the colony diameter of P. cinnamomi in pre-amended PDA medium. The fungicides showed response in inhibiting the growth with a dose dependent effect except for the fungu-force which totally inhibited the fungus at all concentrations tested. Complete inhibition was recorded for Fungu-force at 25ppm, Mancozeb at 1000ppm, Mackecknie gold at 4000ppm and Maneb at 5000ppm. The result of this study can be utilised to develop suitable application regime of these fungicides for trials on farmer’s field in the control of heart-rot disease of pineapple and other crop diseases incited by this pathogen thereby improving food security.

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Introduction

The attempt by man to improve crop yield in order to produce enough food for consumption by the increasing population is a decision in right direction. The most important problems encountered in this attempt are how to drastically reduce or wholly prevent plant disease which is a continual battle. Chemical application is a highly effective technique to manage plant disease in agriculture (Adeniyi and Olufolayi, 2014). Some agrochemicals have been tested and found effective in plant disease control (Nene and Thapliyal, 1993). Certain protective fungicides although hazardous to the environment are still used for the control of fungal disease (Patel et al., 2005; Ilondu, 2013).

Pineapple (Ananas comosus L. (Merr), is an important tropical field crop in regions such as Latin America, Asia and Africa on commercial basis (Kaneshiro et al., 2008) and a herbaceous, perennial crop in the family of Bromeliaceae. It is the third most important tropical fruit in the world production after banana and Citrus (Bartholomew et al., 2003). Nigeria is sixth on the list of world pineapple producers with about 800,000 tonnes per annum. A. comosus fruit is a rich source of vitamin A, B1, B6 and C, copper, manganese and dietary fibre (Office of the Gene Technology Regulator, (OGTR) (2008).

High concentration of Bromelain found in the ripe pineapple fruit is useful in confectionery and pharmaceutical industries as well as in diagnostic laboratories (Amao et al., 2011). The pineapple leaves are a good source of fibre used in the production of Pina cloth (Kochhar, 1986).

Phytophthora cinnamomi is a soil-borne organism causing diseases of many crops including pineapple. Heart rot affects the basal leaf tissues and may cause rot of the fruit as well. The symptoms include rot of the basal tissues of the youngest leaves at the heart of the apical meristem. Such infected leaves may easily pull from the plant with a slight touch and as it advances may lead to total crop failure and subsequent yield reduction (Green and Scot, 2015). In this study, the efficacy of some agrochemicals against pineapple heart-rot pathogen was assessed.

Reference

Adeniyi DO, Olufolayi DB. 2014. Efficacy of fungicides against Lasiodiplodia theobromae, pathogen of infolrenscent dieback of cashew (Anarcardium Occidentale). Comprehensive Research of Agricultural Science (4), 51-56.

Alexopalus CJ, Mims CW, Blackwell  M. 2002. introductory Mycolgoy 4th edition. John Wiley and Sons International, Singapore 869p.

Amao IO, Adebisi OF, Olajide –Taiwo IB, Adeoye B, Olabode I. 2011. Economic analysis of pineapple marketing in Edo and Delta States Nigeria. Libyan Agriculture Research Center Journal International 2(5), 205-208.

Barnett HL, Hunter BB. 1999. Illustrated Genera of Imperfect Fungi 4th edition. The American Phytopathological Society, St. Paul, Minnesota, U.S.A 218p.

Bartholomew DP, Paull, Rohrbachkg RE. 2003. The Pineapple: Botany, Production and Uses. Department of Tropical Plant and Soil Science, CTAHR, University of Hawaii.

Chakrabarty R, Acharya GC, Serma TC. 2013. Effect of fungicides, Trichoderma and plant extracts on mycelial growth of Thielaviopsis paradoxa, under in-vitro condition. The Bioscan 8(1), 55-58.

Green J, Scot N. 2015. Heart and root rots of Pineapple, Plant Disease PD-106, College of Tropical Agriculture, University of Hawaii, Manoa pp1-7.

Ilondu EM, Ayodele SM, Ofere BK. 2010. Comparative efficacy of neem leaf extract (Azadirachta indica (A.) Juss) and three commercial fungicides in the control of Cerosporella leafspot of sweet potato (Ipomoea batatas L.). Nigerian Journal of Botany 23(1), 157-164.

Ilondu EM. 2011. In vitro evaluation of four Fungicides for the control of Sclerotium rolfsii Sacc., the causal agent of rhizome rot of ginger (Zingiber officinale Rose). Nigerian Journal of Science and Environment 10(1&2), 242-250.

Ilondu EM. 2013. Leafspot disease of taro cocoyam (Colocasia esculenta (L.) Schott) caused by Botryodiplodia theobromea and in-vitro control with some agrochemicals. Journal of Food, Agriculture and Environment 11(3&4), 1404-1408.

Kaneshiro WS, Burger M, Vine BG, de Silva SA, Alvarez AM. 2008. Characterization of Erwinia chrysanthemi from a Bacterial heart rot of Pineapple outbreak in Hawaii. Plant Disease 92(10), 1444-1450.

Kochhar SL. 1986 Tropical Crops, A Text Book of Economic Botany: Macmillan International College Editions, New Delhi. 467pp.

Nene YL, Thapliyal PN. 1993. Fungicide in plants Disease control, 3rd edition, Oxford and IBH Publishing Company New Delhi 691p.

Nwanosike MRO, Adeoti AA. 2002. Evaluation of four fungicides for control of cotton leafspot caused by Alternaria macrospora Zimm. Nigeria Assets series Agriculture and Environment 2(2), 165-171.

Office of the Gene Technology Regulator (OGTR). 2008. The Biology of Ananas comosus var. comosus (Pineapple) Version 2, Department of Health and Aging, Australian Government 39p.

Patel NA, Dange SRS, Patel SI. 2005. Efficacy of chemicals in controlling fruits rot of tomato caused by Alternaria solani. Indian Journal of Agricultural Research 39(1), 72-75.

Taskeen UN, Wani AH, Bhet MY, Pala SA, Mir AA. 2011. In – vitro inhibitory effect of fungicides and botanicals on mycelia growth and spore germination of Fusarium oxysporum. Journal of Biopesticides 4(1), 53-56.

Source : Inhibitory efficacy of some agrochemicals on mycelial growth of Phytophthora cinnamomi isolated fromheart-rot disease of pineapple (Ananas cosmosus (L.) Merr.)