Season-long disease management by experimental fungicides on ‘Golden Delicious’, ‘Idared’, and ‘York’ apples, 2006

摘要

Fifteen experimental and combination treatments were compared to registered treatments for broad-spectrum disease control on 6-yr-old ‘Golden Delicious’ (GD), ‘Idared’ (IR), and ‘York Imperial’ (YI) trees. The test was conducted in a randomizedblock design withfour replicates separated by non-treated border rows. Test trees were not treated in 2005 to allow disease pressure to stabilize. Fungicide treatments were applied to both sides of the tree on each indicated application date with a Swanson Model DA-400 airblast sprayer at 100 galA as follows 6 Apr (GD and YI 12-in green, IR TC); 18 Apr (pink-bloom, Bl); 2 May (Bl-petal fall, PF); First through 6th covers (1C- 6C) 16 May, 31 May, 14 Jun, 28 Jun, 11 Jul and 25 Jul. Maintenance applications applied to theentire test block with the same equipment included Asana, Assail, Intrepid, Lannate LV, Lannate 90SP, Imidan, Provado, Calypso, and Acramite. Wild blackberry canes with the sooty blotch and flyspeck fungi and bitter rot mummies were placed over each IR test tree 5 Jul. Other diseases developed from inoculum naturally present in the test area. Fruit data represent counts of 25 fruit per tree harvested and stored at 4 deg C until evaluated; IR (25 Sep, 12Oct); GD (3 Oct, 18 Oct), YI (13-17 Oct). Percentage data were converted by the square root arcsin transformation for statistical analysis.