The bacterium that manufactures the frost wounds it then invades through. The knife test that separates infectious from non-infectious gummosis, the nematode complex, why copper hydroxide works and copper oxide does not, and the entry point most often missed in young trees.
Nine consecutive seasons of observation in the Giannitsa area of Pella: ripening order, fruit size, cracking tolerance, self-fertility and behaviour on each rootstock for twenty varieties, each one with its breeder and the holder of its rights.
Half of the nitrogen used in spring does not come from the soil but from the previous season's reserves, which is why the base dressing almost always goes on at the wrong moment. Where the nitrogen comes from in spring, how much of the fertiliser is taken up by season, storage and the autumn transfer from leaves to buds, and what that means for the programme.
