Mechanical systems were developed and evaluated for the collection and application of dry kiwifruit (Actinidia deliciosa (A. Chev.) C.F. L~g et A.R. Ferguson) pollen to flowers on an extenslve basis. Pollen was collected by a twin cyclone operated from a tractor by one person. Collection rates were up to 140 g/h during both night and day. Purity and germination of the pollen was consistently acceptable. Application was by impaction of dry force-f~ pollen onto a rotating velcro-covered wheel whlch was located in an airstream. The principle was simple and its inherent flexibility permitted the evaluation of various pollen rates, delivery airflows, and m&;hine types. Acceptable fruit yields resulted.

Experimental sprayings of kiwifruit vines with azinphos-methyl, diazinon, and omethoatc were carried out in 1973 and with azinphos-methyl in 1974. Repeated azinphos-methyl <::pplications gave virtually scale-free leaves and fruit at loarvest. Residues of azinphos-methyl [Illd omethoate were unusually high immediately after spraying (up to 18 mg/kg and 11 mg/kg respectively) and residues from some treatments remained above the relevant New Zealand maximum residue limits (MRL) (2 and 0.5 mg/kg) for in excess of 5 weeks. Diazinon residues were lower and decayed to below the New Zealand MRL within 10 days. The fUrface hair on the fruit contributed significantly to the high azinphos-methyl residues.

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Pilot‐testing was undertaken by the Greater Vancouver (B.C.) Water District to determine the feasibility of using direct filtration for treating turbid water. Because episodes of natural high turbidity tended to be of short duration, turbidity spiking was included in the investigation. Results showed that turbid water could be treated successfully with direct filtration when a deep‐bed monomedium filter was used; a shallower dual‐media filter was not acceptable. Even with a high‐turbidity raw water, turbidity and production goals were met. Determining the appropriate dosage of filter aid was a key factor in meeting the performance goals.

No abstract