Two-spotted Spider Mites are developing, especially on hanging baskets, in hot dry areas of greenhouses. Don't forget to check hanging baskets of New Guinea impatiens, ivy geraniums, zonal geraniums, thunbergia, scalevola or mixed baskets with Ipomoea "Blackie" for two-spotted spider mites. Herbaceous perennials in hot, dry areas of a greenhouse are also susceptible. Look on the underside of the oldest leaves along the midveins, for the mites, their eggs and white empty eggshells. You may see faint stippling, or chlorotic growth that resembles a nitrogen deficiency.