Experiments on Curative Low and Ultra-low Volume Spraying Against Dacus oleae Gmel.

Applications of 1, 2, 4, 6 and 12 lit. of spray per tree, each volume containing 6 g. of dimethoate a.i., did not show significant differences between the treatments, but olive fly pupae and third instar larvae were found to be more resistant than first and second instar larvae. Also, no differences became apparent between treatments with Dimecron 50, Carbicron 50 and Nuvacron 50 at rates of 7, 10 and 14 c.c. per tree respectively; these experiments will be continued.     

Studies in Growth and Development in the Genus Fragaria I. Factors Affecting the Rate of Leaf Production in Royal Sovereign Strawberry

The Raspberry Cane Midge is principally important as a precursor of the fungal disease “ Midge Blight This disease may kill a substantial proportion of the canes of varieties such as Newburgh and Mailing Enterprise before they can bear fruit in the following spring (Pitcher and Webb, 1952) ; in addition, the yield of many of the surviving canes is reduced. Fortunately the midge is not a universal pest of raspberries ; in Britain its range is restricted to the south and the Midlands and several varieties, such as Norfolk Giant and Mailing Landmark, are highly resistant.     

The Pollination of Strawberries by Honey-Bees

Pollination of strawberries by honey-bees increased the percentage of flowers that set fruit, the weight of the berries, and the percentage of well-formed berries.     

Improved seed development and germination of stenospermic grapes by plant growth regulators

Plant growth regulators were applied to the foliage and immature fruit clusters of the stenospermic grape selection ‘C35-33’ at various periods before bloom to stimulate viable seed development. In the 1987 season five different plant growth regulators were used, but in 1988 the growth retardants Cycocel and XE-1019 were used exclusively. Chemical treatments applied 35 days after bud break increased significantly germination percentage. Experimental results indicate that the use of certain plant growth regulators may aid in increasing the efficiency of seedless grape breeding by providing an alternative to in-ovulo embryo culture.