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Major Diseases and Pests of Sweetpotato in Eastern Africa

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Major Diseases and Pests of Sweetpotato in Eastern Africa im BESTAVAILABLE COPY Major Diseases and Pests of Sweetpotato in Eastern Africa L.G. Skoglund and N.E.J.M. Smit International Potato Center (CIP) P.O. Box 25171 Nairobi, Kenya I The International Potato Center (CIP) is a not-for-profit, autonomous scientific institution established in 1971 by agreement with the government of Peru. The Center develops and disseminates knowledge to facilitate use of the potato, sweetpotato, and Andean roots and tubers as basic foods in the developing world. CIP is one of 18 international research and training centers supported by the Consultative Group on International Agricultural Research (CGIAR). The CGIAR is sponsored by the Food and Agriculture Organization (FAC) of the United Nations, United the Nations Development Programme (UNDP), and the International Bank for Reconstruction and Development (World Bank), and comprises more than 45 countries, international and regional organizations, and private foundations. International Potato Center Apartado 1558 Lima, Peru ISBN 92-9060-169-8 Press run: 500 Printed in Lima, Peru May, 1994 Cover: Photo of chlorotic spots with and without purple margins induced by SPFMV (taken by S. Fuentes). Skoglund, L.G. and Smit, N.E.J.M. 1994. Major diseases and pests of sweetpotato in Eastern Africa. International Potato Center (CIP). Lima, Peru. 67 n. 1. Sweetpotato--isea,--3s. 2. Sweetpotato-pests. 3. Sweetpotato­ disease control 4 ,v.r3cetpotato-pest control. 5. Sweetpotato-Eastern Africa. I. Skoglund, Linnea G. II.Smit, Nicole E.J.M. Ill. International Potato Center. I~I Contents Page Acknowledgments v Introduction vii PART I 1 Diseases and Pathogens of Sweetpotato and Their Control 3 Follar and Stem Diseases Caused by Fungi 5 Alternariosis, Anthracnose, Blight (,41ternana spp.) 5 Phomopsis Leaf Spot (Phornopsis ipornoea-batatas) 7 Minor Leaf Spot Fungi 9 Chlorotic Leaf Distortion (Fusarium lateritiun) 11 Fusarium Wilt (Fusarium oxysporum f. sp. batatas) 13 Storage Root and Postharvest Diseases 15 Foot Rot (Plenodornus des truens) 15 Java Black Rot (Lasiodiplodia theobromae) 17 Soft Rot (Rh izopus stolonifer, Mucorsp.) 19 Viral Diseases 21 Sweetpotato Feathery Mottle Virus 21 Sweetpotato Mild Mottle Virus 23 Other Viruses 25 Another Problem 27 Fasciation 27 PART II 29 Insect Pests of Sweetpotato and Their Control 31 Foliage Feeders 33 Sweetpotato Butterfly (Acraea acerata) 33 Tortoise Beetles (Aspidornorpha spp.) 35 Sweetpotato Hornvorm (Agrius convolvuh) 37 Minor Leaf-Feeding Pests 39 iii Virus Transmitters 41 Aphids (Aphis gossypu) 41 Whiteflies (Bemisia tabact) 43 Stem Feeders 45 Clearwing Moth (Synanthedon spp.) 45 Striped Sweetpotato Weevil (Alcidodes spp.) 47 Other Stem-Damaging Species 49 Storage Root Feeders 51 Rough Sweetpotato Weevil (Blosyrus spp.) 51 Sweetpotato Weevils (Cylas spp.) 53 Other Storage Root-Damaging SpeciE. 61 Mites 63 Erinose (Aceria sp.) 63 Literature Consulted 64 Acknowledgments The authors would like to thank the following persons for their contributions to this publication: R.W. Gatumbi and A.W. Kihurani of NARL, KARl; 0. Magenya of Kisii RRC, KARl; G.B. Allard and D.K. Rangi of IIBC, Kenya; and K.N. Saxena and K.V. Seshu-Reddy of ICIPE. The authors also extend their thanks to members of the PRAPACE research network for their support. Introduction This publication is meant to be used as a field guide so that researchers, extensionists, and farmers growing sweetpotato throughout Eastern and Central Africa can identify common diseases and pests. It is not meant to be comprehensive but is based on the authors' experiences in those regions as well as surveys conducted in Kenya during the period 1990-1992. In general, of all the constraints mentioned, sweetpotato weevils (Cylas spp.) and virus diseases contribute the most to yield losses. Leaf- feeding insects, especially the sweetpotato butterfly, cause significant losses during outbreaks. We have made general comments about control measures. In most cases (except for sweetpotato weevils), little is known about control under tropical conditions. Though chemical controls may exist and be in use in developed countries, we do not recommend them for Eastern and Central Africa. Photographs in this publication were assembled from collections of different authors, who are acknowledged. vii PART I Diseases and Pathogens of Sweetpotato and Their Control A number of pathogenic organisms affect in Eastern sweetpotato Africa. Most appear to be damage widespread, but levels vary. Diseases become especially a limiting factor, in the dry season. Up to now, mycoplasma-like no bacteria or organisms have been reported. In this guide, we separate fungal pathogens according to the type of disease: foliar and stem diseases, storage root and postharvest diseases, viral diseases. and In general, foliar and stem diseases occur at low levels and cause little damage. they Indirectly, contribute to lower yields by photosynthetic reducing area and transport of nutrients products to the and storage roots. In Eastern Africa, storage rots do not cause much damage sweetpotatoes because are consumed shortly after harvest. However, tuber-rotting pathogens are present in the field and are capable of causing significant losses. Viral diseases have been placed in a separate section, even though they also cause foliage symptoms. Viruses appear to cause the greatest damage in the field and contribute the most to yield losses. 3 Fig. I. Black lesions caused by Altemiana spp on sweelpotato petioles and stems Courtesy L G. Skoglund, Fig 2 Blackened leaf debris on the ' - ground under sweetpotato vines affected by . Courtesy L G Skoglund \ ] t-:,Ibi Foliar and Stem Diseases Caused by Fungi Alternariosis, Anthracnose, Blight Alternaria solani, Alternaria spp. Symptoms. Brown lesions with a typical "target" appearance of concentric rings occur on leaves, especially older leaves. Black lesions appear on petioles and stems (Fig. 1). Bases and middle sections are more affected than terminals of vines. Death of vines can occur. The ground under affected vines is often carpeted with blackened leaf debris (Fig. 2). Biology. On the basis of published information and experience, Alternaria blight can be considered as the most important fungal disease in East Africa. Disease and lesion size increase as altitude increases. High relative humidity or free water is necessary for infection and sporulation. The fungus survives in debris. Spores are spread through infected planting material, wind, splashing rain, and water. Though Alternaria spp. can be found infecting sweetpotato in all agroecological zones of the region, the form known as alternariosis or anthracnose occurs at mid to high elevations. Control. Susceptibility to the pathogen varies among varieties. Pathogen-free planting material of the more resistant varieties and goodsanitation practices should be used. 5 Fig. 3. Sweetpotato leaf spot caused by Phornopsis ipomoea­ batatas. Brown lesions with a dark brown margin on affected leaves. Courtesy L.G. Skoglund. Fig. 4. Phomopsis ipornoea-batatas pycniJia in the center of leaf lesions. Courtesy L. G. Skoglund. Phomopsis Leaf Spot (Phyllosticta Leaf Spot) Phomopsis ipomoea-batatas (Phyllosticta batatas) Symptoms. Whitish to tan to brown lesions, usually less than 10 mm in diameter, form on upper and lower surfaces of leaves. These usually have a dark brown or purple margin (Fig. 3). Pycnidia are visible in the center of the lesions (Fig. 4). Biology. The fungus survives in dehris and is not known to have other hosts. Spores are spread through infected planting material, wind, splashing water, and possibly insects. The disease is widespread in East Africa and occurs in all agroecological zones. It is not known to depress yield, but can reduce the quality of vines for planting material and fodder. Control. No control measures are known. 7 Fig. 5. Brown lesions caused by Cercospora sp. on sweetpotato leaves. Courtesy W.S. Wu. Minor Leaf Spot Fungi Other fungi cause leaf spots and can be identified by inspecting spores with a microscope. These fungi include Alternaria spp., Cercospora sp. (Fig. 5), Septoria sp., Ascochyta sp., Curvularia sp., Colletotrichun sp., and Pestalotia batatae. Control. No control measures are known. I Fig. 6. Mucilaginous layer containing mycelium and sporodochia of Fusarium lateritium. Courtesy C.A. Clark. Fig. 7. Stunting distortion and chlorosis of sweetpotato vines caused by , Fusarium lateritium. Courtesy C.A. Clark. Chlorotic Leaf Distortion (Fusarium lateritium) Symptoms. The first sign or symptom noticed is a white, waxy (crusty) mucilaginous layer that contains mycelium and sporodochia, covering newly expanded leaves (microscopic observation reveals it is also on apical meristems and axillary buds) (Fig. 6). As the leaves age, the waxy covering predominates along the leaf margin but eventually disappears. In some cultivars and environments, leaves become chlorotic. Occasionally, leaves become distorted and plants are stunted (Fig. 7). Biology. The pathogen may be present in the entire surface of the aerial part of the plant and can be transmitted through true seed (it cannot be eliminated by surface disinfection of the seed). Symptoms are more severe in hot, dry weather. There is a long latent period (3to 6 weeks) from infection to symptom expression. The disease has been found in only a few areas of East and Central Africa, primarily at low altitudes where it is hot and dry. It is not known to cause economic damage in its less virulent form. When stunting and distortion occur, losses should be
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