Page 125 Advertisement 1

New Zealand Journal of Agriculture, Volume 87, Issue 2, 15 August 1953, Page 125

Spray Applications for Insect Pest and Disease Control in Home Orchard Apples and Pears Time of application Treatment Pest or disease Buds showing green Bordeaux mixture , (6oz. of blue- ~ Black spot tips stone, soz. of hydrated lime, 4 ' ; gallons of water), or lime sulphur ' (1J pints to 4 gallons of water) Petal fall Lime sulphur (J pint) plus D.D.T. Black spot, powdery (50 per cent, wettable powder) mildew; codling moth, - r (loz.) to 4 gallons of water bronze beetle *3 weeks later Lime sulphur (J pint) plus lead Black spot, powdery arsenate (IJoz.) plus hydrated lime mildew; codling moth, (20z.) to 4 gallons of water bronze beetle, leaf-roller ■ ; ■, , - caterpillar, leech • * Repeat this spray at intervals of about 18 days until a month before the apples are ready to pick. Bordeaux mixture at 3 : 4 : 50 strength (4oz. of bluestone, soz. of fresh hydrated lime, 4 gallons of water) may be used on pear trees in place of lime sulphur sprays. In January or February it may be necessary to apply summer oil at J pint to 4 gallons of water to control red mites. Two sprays are needed 10 to 12 days apart. Oil sprays must not be applied closer than 14 days before or after sulphur sprays. Stone Fruits (Except Apricots) Time of application Treatment Pest or disease Bud movement of leaf Bordeaux mixture (6oz. of blue- Leaf curl, shot hole, buds stone, soz. of hydrated lime, 4 bladder plum, brown rot I gallons of water) Repeat in 7 to 10 days at 40z.-50z.-4 gallons strength on varieties where leaf curl is particularly severe. Before blossoms fully I Lime sulphur (1 pint to 4 gallons I Brown rot, shot hole, - open . I of water) | leaf rust'' Repeat at intervals of 3 to 4 weeks up to 3 weeks before picking. Where leech is troublesome apply D.D.T. (50 per cent.) at loz. to 4 gallons of water. Citrus Trees Time of application Treatment Pest or disease Petal fall of main Bordeaux mixture (4oz. of blue- Verrucosis and other blossom stone, soz. of hydrated lime, 4 fungous diseases ■. gallons of water) ■ Spray in October, November, and December with the same mixture if verrucosis has been troublesome. Early February I Summer oil (1 pint to 4 gallons I Scale insects, sooty ■ ■ • , I of water) > | mould Late May I Bordeaux mixture (as above) plus I Brown rot, hard wax I summer oil (as above) I scale ■ Repeat Bordeaux mixture spray at any time during winter and spring if brown rot appears. If aphis is present, nicotine sulphate (6 teaspoons in 4 gallons of water) should be added. Copper compounds such as “Cuprokylt”, “Cuprox”, “Oxicop”, and “Perenox” at 3oz. to 4 gallons of water are satisfactory substitutes for Bordeaux mixture in most circumstances. When these materials are used on stone fruit trees at the bud movement period or on pip fruit trees at the green tip period the concentration of any of them should be increased to 4oz. in 4 gallons of water. Grapes / Time of application Treatment Pest or disease 2 weeks before bud Lime sulphur (2 pints in 4 gallons Erinose mite, lecanid burst of water)' scale ; powdery mildew ♦'When shoots are 2 Copper compounds such as Downy mildew, black to 4in. long ' “Cuprokylt”, “Cuprox”, “Oxicop”, spot and “Perenox” (3oz. in 4 gallons < ■ I of water) Leaf-roller caterpillar, Plus lead arsenate (loz.) added to grapevine moth, grape- ■ I above spray - vine weevil ___ * Repeat at 14-day intervals up to colour change of fruit. Where powdery mildew is troublesome dust with flowers of sulphur 4 to 6 times during the growing period. ' If mealy bug or thrips are troublesome, use D.D.T. wettable powder (50 per cent.) at Joz. to 4 gallons of water in place of lead arsenate. Orchard Hygiene As prunings are potential hosts for disease, they should be picked up from beneath the trees and destroyed by burning. '