 A major difference between the two is that bot canker do not exhibit the same outward foliage symptoms that Eutypa die-back leave on the leaves and buds of the vine.In addition to the pests noted above, vineyards in the Hunter Valley are usually grafted on phylloxera resistant rootstock to help keep the louse at bay.During the growing season kangaroos are frequent threats to the young buds and shoots of grapevines, requiring tall barb wire fences to keep the hopping creature out.