Incidence, Distribution and Characteristics of Major Tomato Leaf ...

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Incidence, distribution and characteristics of major tomato leaf curl and mosaic virus diseases 138 Mean number of TYLCV-infected plants 8.00 6.00 4.00 2.00 0.00 1 2 3 4 5 6 7 Weeks from transplanting Figure 5.10: TYLCV progress curves for each treatment (n1-n6) ¹ in trial I, Buwama, March to July 1999 Mean number of TYLCV-infected plants 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 n1 n2 n3 n4 n5 n6 1 2 3 4 5 6 7 8 9 Weeks from transplanting Figure 5.11: TYLCV progress curves for each treatment (n1-n6) ¹ in trial II, Buwama, August to November 1999 Mean number of TYLCV-infected plants 1.20 1.00 0.80 0.60 0.40 0.20 0.00 1 2 3 4 5 6 7 8 9 Weeks from transplanting Figure 5.12: TYLCV progress curves for each treatment (n1-n6) ¹ in trial III, Buwama, November 1999to February 2000. ¹n1- Tomato monocrop without spraying dimethoate, as a control treatment; n2- tomato monocrop combined with uprooting of TYLCV symptom-bearing plants; n3- tomato-bean intercrop without spraying dimethoate; n4- tomato monocrop with dimethoate sprayed once a week; n5- tomato monocrop with uprooting and dimethoate sprayed once a week; n6- tomato-bean intercrop with bean rows sprayed once a week with dimethoate. n1 n2 n3 n4 n5 n6 n1 n2 n3 n4 n5 n6
Rainfall (cm) Mean TYLCV-infected plants Whitefly counts Whitefly counts 8.0 6.0 4.0 2.0 0.0 20.0 10.0 0.0 50 25 0 1 3 5 7 9 11 13 15 17 19 21 Weeks from transplanting n1 n2 n3 n4 n5 n6 n1 c1 n2 c2 n3 c3 n4 c4 n5 c5 n6 c6 Incidence, distribution and characteristics of major tomato leaf curl and mosaic virus diseases 139 Trial I Trial II Trial III 1 3 5 7 9 11 13 15 17 Weeks from transplanting 1 3 5 7 9 11 Weeks from transplanting Figure 5.13: Treatment effects on incidence of TYLCV diseases and whitefly infestation of tomato plants in the three trials, i.e. Trial I, Trial 2 and Trial 3, in relation to rainfall. Like in the general study of whitefly population dynamics in the tomato agro-ecosystem (sections 20.1.1 and 20.1.2), rainfall frequency during the experimental period reduced both number of whitefly on tomato plants and number of TYLCV diseased plants in individual treatments. However, being that whiteflies transmit TYLCV in a persistent maner, even one whitefly in the field is of paramount importance. Similary, a single focus of TYLCV disease is a potential source of inoculum for other plants to be infected, and it is worth when few infected plants represent scattered foci from where the disease can be transmitted to other plants, not to mention the role played by alternative hosts.
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Incidence, Distribution and Charact
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Charles SSEKYEWA Incidence, Distrib
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CONTENTS 1 CHAPTER 1...............
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ACKNOWLEDGEMENT The following perso
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vii 7 mosaic virus (CMV), Alfalfa m
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ix 9 Consequently, our findings con
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SAMENVATTING Tomaat is een economis
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xiii 13 Beide genhomologie percenta
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xv 15 dit onderzoek geven ook aan d
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LIST OF TABLES xvii 17 Table Page 1
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ACRONYMS AND ABBREVIATIONS xix 19 A
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Abbreviation Word in full PCR Polym
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Incidence, distribution and charact
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A B Incidence, distribution and cha
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A Incidence, distribution and chara
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Books Incidence, distribution and c
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