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 unusually heavy rains saturate the soil, a tomato plant's leaves may curl. Plant roots need air, just like the above ground parts. When heavy rains saturate the soil, the roots can't get enough air. This can result in root damage, which causes the tomato to react in a similar way to sudden hot weather.
Several fungal diseases will cause the leaves of citrus tree to curl, distort, yellow, wilt and drop prematurely from the tree. Bacterial blast and botrytis disease are two of these fungal diseases that lead to leaf curling.Bacterial blast starts out as black lesions on the petiole and moves to the axil.phids, spider mites, citrus leaf miners, scale insects and mealybugs are a few of these sap-sucking pests that will cause the leaves to curl, wilt and die. Introducing predatory insects that feed on the sap-sucking pests will help keep their numbers in check.