Spinosad primarily targets caterpillar larvae. if you have only beetles spinosad may not be very effective at targeting them. Try washing the plants with insecticidal soap to hopefully get any pheromones off the plant that are drawing new pests to the plant. I crush the beetles and actually leave the dead body(ies) on the leaf. If you aren't organic sevin or malathion works well, too. I try to keep them picked off myself, but try to make sure you aren't spraying while there are bees on the plants pollinating them.
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carolyn k
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