Registro da ocorrência de Meloidogyne incognita no porta-enxerto 'IAC 766-Campinas' no estado de Pernambuco e rea??o de porta-enxertos e de cultivares copa de videira a Meloidogyne spp.

摘要

The occurrence of root-knot nematode Meloidogyne incognita (Est. I2) is reported in grapevine in Petrolina municipality, State of Pernambuco. Grape plants of Festival cultivar grafted on the 'IAC 766 - Campinas' rootstock attacked by M. incognita exhibited symptoms of less vigorous growth, yellowing and sparse leaves and multiple galls in the root system in an area cultivated with jack-bean (Canavalia ensiformis) also infected by the same nematode. In order to evaluate resistance of four tropical rootstocks, eight temperate and two cultivars Chardonnay and Niagara Rosada in reaction to M. incognita and M. arenaria, this study was carried out. Seedlings of the investigated grapevine genotypes were maintained in pots with sterilized soil and subsequently inoculated with 10,000 eggs + J2 of M. incognita or M. arenaria per plant in a six replicate design. Eight months after nematode inoculation, each plant was evaluated by counting gall and eggs. The final number of eggs (FP) of each Meloidogyne specie was calculated and the reproductive factor (RF = FP/IP), determined. Among the tested rootstocks, 'Harmony', 'Salt Creek', '1103 Paulsen', 'IAC 572-Jales', 'IAC 313-Tropical', 'K5BB Kober', 'SO4' , were resistant (RF<1.00) and, 'Solferino', immune (RF=0.00) to M. incognita, the remaining rootstocks were susceptible to the nematode. With exception of '106-Traviú', '420 A', 'Rupestris du Lot' and '1103 Paulsen', all tested rootstocks were resistant (RF>1.00) to M. arenaria. In contrast, both tested grapevine scion cultivars were susceptible to the investigated Meloidogyne species.