Pine-needle-aphid
Guides
Eulachnus rileyi
pine needle aphid
Eulachnus rileyi is a pine needle aphid native to North America that has become established in pine plantations across Africa, South America, and Europe. It feeds on phloem sap of pine needles, showing preference for 3-4 year old foliage. Populations exhibit bimodal peaks in spring and autumn, with crashes during heavy rainfall periods. The species reproduces parthenogenetically, producing both winged dispersal forms and wingless forms. It is considered a significant pest in commercial pine plantations, where dense infestations can cause needle yellowing, reduced growth, and tree stress.