. Cranberries; : the national cranberry magazine. Cranberries. or a commercial applicator. On a per-acre basis, the cost for applica- tion by any such individual pro- bably will not exceed that by heli- copter. To this larger cost must be added the much smaller cost of operating a pump. Whether the pump is powered by electricity, propane gas or gasoline, the cost amounts to 10 cents or less per acre. The total costs for applying parathion and azinphosmethyl by helicopter to bogs of varying productivity are listed in Table 1. Benefits: By applying insecti- cide at the proper time(s), the bog ow
. Cranberries; : the national cranberry magazine. Cranberries. or a commercial applicator. On a per-acre basis, the cost for applica- tion by any such individual pro- bably will not exceed that by heli- copter. To this larger cost must be added the much smaller cost of operating a pump. Whether the pump is powered by electricity, propane gas or gasoline, the cost amounts to 10 cents or less per acre. The total costs for applying parathion and azinphosmethyl by helicopter to bogs of varying productivity are listed in Table 1. Benefits: By applying insecti- cide at the proper time(s), the bog owner may receive payment for berries which otherwise would have been consumed by fruitworm larvae. This "saved loss in yield" can be estimated according to the follow- ing rationale. A fruitworm larva hatching in early July (berry set) needs an average of six cranberries to complete its development. Thus, if two unhatched and unparasitized fruitworm eggs are observed on 100 randomly picked berries in early July, 12 berries fewer will be harvested. This represents a 12 per cent loss in yield. Given such an infestation, a bog expected to yield 100 barrels per acre would only yield 88 barrels. The loss of 12 barrels per acre equals a monetary loss of $260 per acre, based on the average return per barrel of $ from the Ocean Spray Cranberries cooperative in 1978. Due to increased berry size in late July and August (berry growth), three to five berries are needed for larval development. An egg count of two during that time means at least a 6 per cent loss at harvest. A bog expected to yield 100 barrels per acre would only yield 94 barrels. The loss of six barrels per acre translates into a loss in income of about $ 130 per acre. Other "saved losses in yield" for multiple applications are listed in Table 1 for bogs of varying productivity. The applicability of the abot rationale hinges on four assump tions: (1) The egg count per 100 randomly picked berries refl
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