A number of species exist, but one of the most common is the green peach aphid. They feed particularly on buds and the undersides of leaves by inserting their tube-like piercing mouthparts and withdrawing sap. A secondary problem arises from sugary honeydew excreted by the aphids. Mealybugs Of the many species that may occur on greenhouse floral crops, probably the most common one is the citrus mealybug. Mealybugs injure plants by sucking juices from tender foliage and roots of many greenhouse crops.
Heavy infestations result in stunted and distorted new growth.
Additionally, like many other insects, honeydew is excreted which gives rise to black sooty mold. Spidermites Mites are not insects but, rather, are more closely related to scorpions and spiders. Unlike insects, adult mites have four pairs of legs regardless of the species. Two-spotted mites cause chlorotic stippling of leaves giving the appearance that a fine tan to yellow sand has been sprinkled on the foliage. This symptom is very distinctive and is readily recognized by experienced growers.