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About 90% of the root mass is in the upper 20–30 cm (8–12 in) of soil; some lateral roots can penetrate up to 2 m (6 + 1 ⁄ 2 ft) deep. [6] The inflorescence is an unbranched and indeterminate terminal raceme measuring 50–100 cm (20–40 in) tall, [6] with flowers that are yellow or white.
Essential oils of lavender and any type of mint (peppermint, spearmint, catnip, etc.) are known to repel bugs and often appear in premade repellents as active ingredients. Oil of lemon eucalyptus ...
Winter ploughing will kill many of the pests, and expose many more to predators. In suitable areas this is a powerful means of control, for example in grain fields. [ 1 ] The same principle permits some domestic gardeners to kill the caterpillars without the problems associated with the use of pesticides; the first line of control can be to ...
Some caterpillars even bite the female wasps that approach them. Some insects secrete poisonous compounds that kill or drive away the parasitoid. Ants that are in a symbiotic relationship with caterpillars, aphids or scale insects may protect them from attack by wasps. [18] [19] Parasitoid wasps are vulnerable to hyperparasitoid wasps.
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The cabbage moth (Mamestra brassicae) is primarily known as a pest that is responsible for severe crop damage of a wide variety of plant species. The common name, cabbage moth, is a misnomer as the species feeds on many fruits, vegetables, and crops in the genus Brassica (i.e. cabbage , broccoli , Brussels sprouts ). [ 1 ]
Diamondback moths prefer the cabbage plant, from the plant species Brassica oleracea, as their host plant. The females lay eggs only on the leaves of the cabbage and do not discriminate between young and more developed leaves. However, females are more likely to deposit their eggs on a host with larval infestation.
Root, tuber and bulb crops — like carrots, beets, radishes, potatoes and onions — need more water once crops have “set” in the soil, but they still need to grow a thickness to them.