Salmonella-Shigella plates. Salmonella-Shigella (SS) plates are used to detect bacterial contamination on raw meat. Salmonella-Shigella agar plates contain lactose, bile salts, ferric citrate, and neutral red.The bile salts select for Gram-negative bacteria.almonella-Shigella plates. Salmonella-Shigella (SS) plates are used to detect bacterial contamination on raw meat. Salmonella-Shigella agar plates contain lactose, bile salts, ferric citrate, and neutral red.
The best time to prune them is in early spring, just before they put on their growth spurt. You can do minor shaping and pruning at other times of year, too. Test Garden Tip: Save on holiday decorations by snipping a few branches for winter holiday greenery.
When should we fertilize, prune, plant, cut back, harvest, etc? Here are a few important âtimingâ answers. Prune. The best time to prune most plants is when they are dormant in the early or late winter. Before trees leaf out, you can see the branch structure and decide which limbs to remove and which to save. When pruning to thin out a tree, it is important to maintain the natural shape by carefully selecting tall, outlying branches for removal. When you prune during dormancy the trees stored resources are still in the roots and large stems. After pruning, trees can concentrate those resources in the remaining branches for a good growth flush.