Impact of the potato inoculation date on potato virus Y load and viral distribution in daughter tubers at harvest

Aged plants are more difficult to infect than young plantlets. This modification of susceptibility is described as mature plant resistance (MPR). For potato virus Y (PVY), MPR known lead low infection rates inoculated at the postflowering stage and a decrease in number infected daughter tubers. However, impact inoculation date on capacity PVY accumulate tubers has not been studied so far. Field greenhouse experiments were carried out better understand epidemiology help growers evaluate consequences early/late infections quality their crops. In field trials, (cv. Bintje) covered by insectproof nets from planting harvest except for 14-day period expose natural infections. Under controlled conditions, mechanically with different dates preflowering stages (early inoculations) (late inoculations). At harvest, individually collected analysed define proportions viral load according time between harvest. Our results showed that although age can modify infection, return, early late inoculations similar scale equivalent accumulation All together, these data revealed both high risks sanitary