A color-enhanced aid for location of the transverse horizontal opening and closing axis of the mandible von Zuccari, A.G, Andres, C.J, Simpson, G.W

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Effects of aluminum foil mulches upon abdundance of aphids on, and yield of potatoes in northeastern Maine von Shands, W.A, Simpson, G.W

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Insect predators for controlling aphids on potatoes. 4. spatial distribution of introduced eggs of two species of predators in small fields von Shands, W.A, Simpson, G.W

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Insect predators for controlling aphids on potatoes. 2. in small plots with two kinds of barriers, in small fields, or in large cages von Shands, W.A, Simpson, G.W

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Insect predators for controlling aphids on potatoes. 8. green peach aphid consumption by Coccinella septempunctata and Coccinella transversoguttata von Shands, W.A, Simpson, G.W

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Insect predators for controlling aphids on potatoes. 6. development of a spray technique for applying eggs in the field von Shands, W.A, Gordon, C.C, Simpson, G.W

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Insect predators for controlling aphids on potatoes. 6. development of a spray technique for applying eggs in the field. y5Coccinella, Chrysopa von Shands, W.A, Gordon, C.C, Simpson, G.W

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Insect predators for controlling aphids on potatoes. 5. numbers of eggs and schedules for introducing them in large field cages von Shands, W.A, Simpson, G.W, Gordon, C.C

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Insect predators for controlling aphids on potatoes. 3. in small plots separated by aluminum flashing strip-coated with a chemical barrier and in small fields von Shands, W.A, Simpson, G.W, Storch, R.H

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Insect predators for controlling aphids on potatoes. 9. winter survival of Coccinella species in field cages over grassland in northeastern Maine von Shands, W.A, Simpson, G.W, Storch, R.H

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Insect predators for controlling aphids on potatoes. 1. in small plots von Shands, W.A, Simpson, G.W, Brunson, M.H

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Dichlorvos: a useful tool in research on biological control of aphids von Shands, W.A, Clockedile, S.H, Simpson, G.W

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Evaluation of field introductions of two insect parasites (Hymenoptera: Braconidae) for controlling potato-infesting aphids von Shands, W.A, Simpson, G.W, Simpson, B.A

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Insect predators for controlling aphids on potatoes. 7. a pilot test of spraying eggs of predators on potatoes in plots separated by bare fallow land von Shands, W.A, Simpson, G.W

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Mass rearing of the parasites Praon sp. and Diaretiella rapae von Simpson, B.A, Shands, W.A, Simpson, G.W

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Entomophthoraceous Fungi Attacking the Potato Aphid in Northeastern Maine in 19601 von Shands, W. A., Hall, I. M., Simpson, G.W.

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Leo Wilfred Boulanger, 1924--1970 von Dean, R.W, Clark, J, Simpson, G.W

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THE DICK TEST AND ACTIVE IMMUNISATION AGAINST SCARLET FEVER von Benson, W.T., Simpson, G.W.

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Effect of time of inoculation with potato leafroll virus on development of net necrosis and stem-end browning in potato tubers von Manzer, F. E., Merriam, D. C., Storch, R. H., Simpson, G. W.

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Improved laboratory production of eggs of Coccinella septempunctata von Shands, W.A, Holmes, R.L, Simpson, G.W

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