Issue link: https://read.dmtmag.com/i/314286
www.goodfruit.com GOOD FRUIT GROWER JUNE 2014 31 Commercial Geneva apple rootstocks Percent Equivalent Fireblight Replant Woolly apple Tree size % Malling size resistance Tolerance resistance G.11 <30 M.9 337 Partial 1 G.41 30 M.9 337 G.214 35 M.9 Nic 29 G.16 2 35 M.9 Nic 29 Partial X G.222 3 40 M.9 Nic 29 Partial G.935 40 M.9 Nic 29 X G.210 40 M.9 Nic 29 G.202 4 45 M.26 X G.890 45 M.26 G.30 45 M.26 X 1 Partial indicates some tolerance, better than M.9. 2 G.16 is not recommended due to its virus sensitivity, lack of replant and woolly resistance. 3 G.222 is a M.9 equivalent in Washington State trials. 4 G.202 is not as productive as other genotypes and is not shown to be replant tolerant in Washington State. SOURCE: Tom Auvil, Washington Tree Fruit Research Commission. • G.222 is a recent release that is sim- ilar to M.9 in vigor and precocity. It is resistant to fire blight, phytoph- thora, and woolly apple aphids. It is not as replantolerant as other clones. It is equal to M.9 in productivity and orchard performance. G.222 is rated as an M.26-class rootstock in the East, but has not shown that level of vigor in Washington. One challenge in evaluating the replant-tolerant rootstocks is judging their relative vigor and canopy volume. In difficult replant sites, the Geneva rootstocks with replant tolerance will out-grow more vigorous Malling or Budagovksy rootstocks. Tree size can be evaluated only by comparing rela- tive vigor in loam or clay loam soils that have been fumigated and reconditioned for new trees. In most cases, the appear- ance of the trees on replant-tolerant root- stocks is surprisingly similar in fumigated and unfumigated plots. In all replant tri- als, all the fumigated plots initially out- yield the unfumigated plots, regardless of rootstock genotype. Over time, the replant-tolerant Geneva rootstocks in unfumigated plots out-yield M.9, Bud 9, or M.26 in fumigated plots. (Continued on page 33) CONTINUOUS TRELLISLOK ™ (Nut) The Continuous TrellisLok provides all the advantages of the TrellisLok (strap); however, if you use the TrellisLok with AgLok, your maximum diameter is limitless. BRANCHLOK ™ Trellis & Fence Wire Anchor Embossed jaws grip the wire as it is inserted and prevent it from being pulled out. The wire is retensionable with a pair of pliers or a claw hammer. Toll-Free: 877.552-4828 909.451-2299 • Fax: 909.593-8309 Keeping things growing in the right direction! For your nearest dealer, contact AgFast at…