Answer: It sounds like your faithful raspberry is being invaded by a scale insect of some sort. The home-made solution of tobacco juice is actually a wide-spectrum poison (to good bugs, humans and other mammals, too!). Gardens Alive (5100 Schenley Place, Lawrenceburg, IN 47025; 812/537-8650) carries Eco-oil, a spray that suffocates the insects. Your local garden center may sell it as well. Do you prune your raspberry every year? If the scale is on old canes, you may simply need to prune them out, since canes that fruited last year will not bear again this year. If you need any instructions on pruning, let me know!
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