Mordwilkoja vagabunda

(Walsh, 1863)

Poplar Vagabond Aphid

A gall-forming that induces distinctive galls on Populus deltoides (eastern cottonwood). Nymphs exhibit anti- including synchronized rhythmic movements and active defense against pyralid larvae using legs and rostrums. Unlike some related aphids, defensive nymphs include alatoid forms rather than specialized first-instar soldiers. The has a complex with alternation between primary and secondary .

Mordwilkoja vagabunda by no rights reserved, uploaded by Adam Kranz. Used under a CC0 license.

Mordwilkoja vagabunda by the Smithsonian. Used under a CC0 license.

Pronunciation

How to pronounce Mordwilkoja vagabunda: /mɔrdˈwɪlkoʊja væɡəˈbʌndə/

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Images

Habitat

Forms galls on Populus deltoides (eastern cottonwood). Galls provide enclosed feeding and breeding chambers within leaf or petiole tissue.

Distribution

Eastern North America; documented from Ithaca, New York and Vermont, USA.

Seasonality

Gall formation and nymph activity observed in July in Ithaca, NY.

Diet

Phloem sap of Populus deltoides.

Host Associations

Populus deltoides - primary Galls formed on this ; site of and production
pyralid moth larvae - Attacked nymphs in experimental encounters; not a true

Life Cycle

Complex involving alternation between primary (Populus deltoides, where galls form) and secondary host. on primary host produces . Parthenogenetic occurs during gall phase and on secondary host. Nymphs of all instars present in galls; alatoid nymphs observed participating in defense.

Behavior

Nymphs defend against by clawing with legs and pressing rostrums against attackers, possibly to pierce . Synchronized rhythmic burst movements occur among nearby aphids, hypothesized as collective anti-predator defense comparable to Aphis nerii. Alatoid nymphs participate in defense rather than only specialized first-instar soldiers.

Ecological Role

Gall-former on Populus deltoides; modifies plant tissue to create protected feeding chambers. Serves as prey for pyralid larvae and potentially other .

Similar Taxa

Pemphigus speciesRelated gall-forming aphids with specialized first-instar soldier for defense; M. vagabunda differs in using alatoid nymphs for defense
Aphis neriiExhibits similar collective twitching and kicking anti- responses; comparison made in behavioral studies