Cooking and purifying the base. 3 Next, the gum base is cooked in kettles at 243 degrees Fahrenheit (116 degrees Celsius) until it has melted into a thick syrup. To purify it, workers pass it through screens and place it in a high speed centrifuge before refiltering it, this time through finer screens.
When tomato leaves curl due to viral infections, you'll usually see other symptoms. Tomato plant leaves are sensitive to some viral diseases that cause the leaves to curl. These viruses affect the plantâs appearance and also reduce fruit yield and quality. If the only symptom is curled leaves, your tomato plant might have a condition known as physiological leaf roll.
Symptoms: Leaf miner larvae tunnel through the lamina of the tomato leaf eating the chlorophyll-rich mesophyll cells as they go. This leaves an irregular track of dead tissue that eventually causes the leaf to stop functioning. High levels of damage on vegetable crops cause stunted growth and reduced yield. High populations of adult flies can injure leaves by producing egg-laying and feeding scars called âstipples.â