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Some indoor plants often affected are geranium ( especially the ivy-leaved types ) , clivia or Kaffir lily , peperomia , jade plant , members of the Ficus family , schefflera , epiphyllum ( orchid cactus ) , English-ivy , and begonia . Some outdoor plants such as vegetables in the tomato family and the cabbage family can also be affected . Avoid areas surrounded by trees , which provide too much shade , compete with plants for water and nutrients , and interfere with air movement around plants . Grapes need full sunlight and high temperatures to ripen , so plant on southern slopes , the south side of windbreaks , or the south sides of buildings . Some research indicates that the use of oat straw mulch may reduce leafhopper numbers .