Abstract
The bait insecticides, hydramethylnon and abamectin, were very effective against the bigheaded ant, Pheidole megacephala (F.). Of the 10 attractants tested, the Argentine ant, Iridomyrmex humilis (Mayr), was highly attracted to honey:water (1:1), while the bigheaded ant was highly attracted to peanut butter:soybean oil (1:1). Addition of 1% boric acid to honey:water significantly lowered the attractancy to Argentine ants. One application of permethrin 3.2 emulsifiable concentrate (EC), chlorpyrifos 50 wettable powder (WP) and 1.0 microencapsulated, cyfluthrin 20 WP and 2 EC, and fenpropathrin 2.4 EC as a barrier treatment to the tree trunk area reduced Argentine ants infesting pink frost banksia, Banksia menziesii R. Br., flowers. Sticky bands were also effective as a barrier treatment against Argentine ants, but resulted in phytotoxicity to B. menziesii. Chlorpyrifos 50 WP and 4 EC were phytotoxic to cultivar ‘Sunburst’ pincushion protea, Leucospermum cordifolium (Salisb. ex Knight) Fourcade, causing unmarketable flowers with crooked and short stems. Fenpropathrin 2.4 EC was not phytotoxic to ‘Sunburst’ protea.
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