Cavariella aegopodii Scopoli Willowcarrot aphid

This aphid is an important pest of carrot; infestations also occur on other umbelliferous crops, including celery, parsley and parsnip. The aphids cause significant damage to early and mid-season crops, infested leaves turning yellow and plants becoming stunted. The aphids are also important vectors of persistent viruses (e.g. carrot motley dwarf, carrot red leaf), semi-persistent viruses (e.g. parsnip yellow fleck) and non-persistent viruses (e.g. celery mosaic), the foliage of affected plants often becoming mottled with yellow.

BIOLOGY

Winter eggs occur on Salix (especially S. alba and S. fragilis). In spring, colonies of aphids develop on the young shoots, culminating in the production of winged forms that migrate in May

supracaudal process

Fig. 192 Tip of abdomen of willow/carrot aphid, Cavariella aegopodii.

supracaudal process

Fig. 192 Tip of abdomen of willow/carrot aphid, Cavariella aegopodii.

to umbelliferous summer hosts. Colonies on these secondary hosts occur mainly from late May to early July. There is then a return migration to primary hosts where oviparae are produced and eggs laid. Although usually overwintering on primary hosts in the egg stage, viviparous aphids may survive the winter on overwintering umbelliferous plants or in carrot clamps.

DESCRIPTION

Aptera 1.0-2.6 mm long, mainly green to yellowish-green or reddish, elongate-oval, dorsoventrally flattened; siphunculi relatively long and distinctly swollen apically; body with an elongated tubercle (the supracaudal process) on the eighth abdominal tergite (Fig. 192).

Building Your Own Greenhouse

Building Your Own Greenhouse

You Might Just End Up Spending More Time In Planning Your Greenhouse Than Your Home Don’t Blame Us If Your Wife Gets Mad. Don't Be A Conventional Greenhouse Dreamer! Come Out Of The Mould, Build Your Own And Let Your Greenhouse Give A Better Yield Than Any Other In Town! Discover How You Can Start Your Own Greenhouse With Healthier Plants… Anytime Of The Year!

Get My Free Ebook


Post a comment