Tropical Diseases of Legumes by Julio Bird

By Julio Bird

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Species of the genus Sida, such as 5. rhombifolia L. and S . micrantha, that are extremely susceptible to the Abutilon mosaic virus, behave as very resistant to golden mosaic virus. Malva parviflora is a host plant of the t w o viruses, reacting to bean golden mosaic virus w i t h s y m p t o m s that may differ f r o m those induced by the other virus (Costa, 1 9 6 5 ; Flores and Silberschmidt, 1 9 6 6 ) . A t t e m p t s to determine the particle morphology of this virus in partially purified preparations or in leaf dips gave negative results.

Soc. B. 1 2 7 , 543-76. 25 This page intentionally left blank I N C R E A S E IN T H E P O P U L A T I O N A L D E N S I T Y O F BEMISIA TABACI, A THREAT OF WIDESPREAD VIRUS INFECTION O F L E G U M E C R O P S IN B R A Z I L A . S . Costa I. 11. Introduction 27 W h i t e f l y - t r a n s m i t t e d Diseases of the B e a n and S o y b e a n C r o p s In Brazil 28 A . Bean Crumpling 28 B . B e a n D w a r f Mosaic 30 C . Bean Golden Mosaic 34 III. D. S o y b e a n C r i n k l e Mosaic 37 E . S o y b e a n D w a r f Mosaic 38 R e l a t i o n s h i p B e t w e e n W h i t e f l y - t r a n s m i t t e d B e a n and S o y b e a n Diseases f r o m D i f f e r e n t C o u n t r i e s IV.

If the plant is infected after making some g r o w t h , the s y m p t o m s will be evident only in the new g r o w t h , it may have short and zig zag internodes and small leaves w i t h greenish y e l l o w mottle. Leaves well developed before infection remain normal or might even be larger than normal. Plants at this stage may resemble bean plants infected w i t h the curly top virus in Western U n i t e d States, except for the y e l l o w mosaic spots in the younger leaves. Infected plants usually do not produce pods, but if these are present they may be m a l f o r m e d .

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