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Aphids are repelled by strongly aromatic plants such as lavender, marigolds, garlic and mint. Plant these among your more vulnerable plants. Using trap plants is a different approach.
Aphids on plant host. Plants mount local and systemic defenses against aphid attack. Young leaves in some plants contain chemicals that discourage attack while the older leaves have lost this resistance, while in other plant species, resistance is acquired by older tissues and the young shoots are vulnerable.
Aphids do best when amino acids are actively translocated in the phloem. In spring, the leaves grow and import amino acids via the phloem; in summer leaves are mature and export mainly sugars. In autumn, the leaves senesce and export amino acids and other nutrients. Thus on trees the leaves are most suitable for aphids in spring and autumn.
Ants climb the host plants and feed on the honeydew secreted by the aphids. Many species of ants have developed behaviours to enable them to protect and encourage their aphids. Black garden ants ( Lasius niger ), for example, remove predators such as ladybirds from the vicinity of aphids, thus keeping their "milk cows" safe. [ 13 ]
Learn what causes aphids and how to identify, kill, and control them naturally for healthy plants with no aphid holes. An aphid infestation can ruin a garden. Learn what causes aphids and how to ...
Rhopalosiphum maidis (corn leaf aphids) on Zea mays (maize) Under enhanced CO 2 conditions, the growth rate and reproduction of R. maidis on barley were significantly decreased. [ 14 ] Volatiles of barley grown under enhanced CO 2 were also less attractive than those from plants grown under atmospheric CO 2 . [ 15 ]
Some plant varieties are more resistant to attack than others. In a study on tomatoes, it was shown that the aphids preferred smooth to hairy leaves and that susceptible tomato plants had higher sucrose , lower quinic acid and higher alanine and tyrosine levels. [ 10 ]
Brevicoryne brassicae, commonly known as the cabbage aphid or cabbage aphis, is a destructive aphid (plant louse) native to Europe that is now found in many other areas of the world. [1] The aphids feed on many varieties of produce, including cabbage , broccoli (especially), Brussels sprouts , cauliflower and many other members of the genus ...
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