Many feed on the phloem of the plant, the main sap stream. Because plant sap is loaded with sugars and water, most of the excess is excreted by these insects in the form of a sticky material known as honeydew . Others suck sap from individual cells. This order includes many of the most important plant pests found in the region, including Russian wheat aphid, potato psyllid, and the green peach aphid. Within hours to two days, the insect again molts to the final adult form.
Mayflies are the only insects that molt after winged forms have been produced.
The immature nymphs are found in water and possess a unique, extensible mouthpart that can rapidly extend forward to grab prey. Adults are excellent fliers which capture other insects in flight. The dragonflies hold their wings horizontally when at rest, while the more slender-bodied damselflies have wings that project backward over the back. A few are predators of insects and mites. Life cycle of the onion thrips.