’n Gids tot Wingerdabnormaliteite in Suid-Afrika - P.G. GOUSSARD

1 PLANTMATERIAALPROBLEME_______________________________________ 8 2 SWAMSIEKTES____________________________________________________ 14 2.1 Oïdium ____________________________________________________ 16 2.2 Donsskimmel _______________________________________________ 28 2.3 Streepvlek__________________________________________________ 40 2.4 Swartroes (antraknose) _______________________________________ 47 2.5 Botrytis (vaalvrot) ___________________________________________ 53 2.6 Suurvrot en blougroen/swartskimmels___________________________ 62 2.7.1 Swamsiektes geassosieerd met hout en wortelverrotting/afsterwing ___ 70 2.7.2 Swamsiektes geassosieerd met hout en wortelverrotting/afsterwing ___ 81 3 BAKTERIESE SIEKTES ______________________________________________ 94 3.1 Vlamsiekte _________________________________________________ 95 3.2 Kroongal __________________________________________________ 103 4 VIRUS EN VIRUSAGTIGE SIEKTES __________________________________ 110 4.1 Netelblaar_________________________________________________ 112 4.2 Rolblaar __________________________________________________ 120 4.3 Gleufstam en skurfbas ( rugose wood kompleks)____________________ 136 4.4 ShirazSiekte _______________________________________________ 146 4.5 ShirazTerugsterwing ________________________________________ 157 4.6 Wingerdvlek (fleck) en rasperblaar (enation) _____________________ 161 4.7 Astervergeling _____________________________________________ 169 5. WINGERDPLAE __________________________________________________ 177 5.1 Filloksera, margarodes en nematodes ___________________________ 178 5.2 Snuitkewers/kalanders en krompokkels _________________________ 186

6 • ’n Gids tot Wingerdabnormaliteite in Suid-Afrika