Influence of Basic Fungicide Groups on Pollen Germination of Grape Varieties Bolgar
and Cabernet Souvignon
A. NIKOLOV, P. BOTIYANSKI, D. KEHAYOV and V. ROICHEV
Agricultural University, BG-4000 Plovdiv, Bulgaria
NIKOLOV, A., P. BOTIYANSKI, D. KEHAYOV and V. ROICHEV, 1999. Influence of basic fungicide groups on pollen germination of grape varieties Bolgar and Cabernet Sauvignon. Bulg. J. Agric. Sci., 5: 719-724
In the period 1996 – 1998, the effect of different fungicide groups on pollen germination of grape varieties Bolgar and Cabernet Sauvignon was tested at the laboratory of the Department of Agrarian Ecology of the Agricultural University in Plovdiv. It was established that triazole fungicides demonstrate selective toxicity to pollen germination of tested varieties. Benzimidazol Topsin M and the combinations of morpholin Acrobat 50WP with Folicur 250EC (tebuconazol), Thiozol 80WP (wettable sulfur) and Shavit 10EC (triadimenol) can be applied to Bolgar variety during flowering and the latter – to Cabernet Sauvignon as well. Dithiocarbamate fungicides Dithane M45, Perocin 75WP (zineb), Polyram combi (metiram) and phenylamides – Ridomil plus (metalaxyl) and Sandofan S60 WP (oxydyxil) (applied independently) are tolerant for Bolgar pollens but inhibit pollen cell germination of Cabernet Sauvignon variety. Cuprous products inhibit pollen germination in both varieties, Champion HP being the comparatively most tolerant among them. The sulfur product Thiozole 80 WP (applied independently), the dicarboxymides Rovral 50WP (iprodion) and Sumilex 50WP (procimidon) as well as Quadris 5SK (azoxystrobin) can be used during flowering of Bolgar variety but are not recommended for Cabernet Sauvignon.
Key words: fungicides, pollen, varieties, flowering