by University of Portsmouth, School of Biological Sciences in Portsmouth .
Written in English
Thesis (Ph.D.) - University of Portsmouth, 2002.
Aphids are economically important pests of glasshouse and temperate crops. By investigating the effects of aphid feeding on plant performance and by understanding the host-pest relationship, novel defence strategies can be devised. The effect of \(Rhopalosiphum\) \(padi\) (the bird cherry-oat aphid) feeding on young \(Hordeum\) \(vulgare\) (barley) plants was investigated. Systemic insecticides enter a plant's sap supply. Aphids seek their nourishment by penetrating the plant's tissue with their sharp mouths to suck the plant's nutrient-rich sap, which makes systemic insecticides highly effective for aphid pest control. Considerations. Aphids often congregate in the curling leaves of the plant or high in a tree's. Spirotetramat, a spirocyclic tetronic/tetramic acid derivative (spirodiclofen, spiromesifen and spirotetramat), is a systemic insecticide developed for the control of sucking pests, such as aphids. greenhouse. Each plant was inoculated with apterous adult when emerging in the morning. Aphids were collected after 10 days by brushing them carefully from the leaves. Bioassay test To determine the insecticidal effect of etheric, ethanolic, and aqueous extracts of selected plants, 15 M. persicae apterous larvae (3 to 4 days-old).
A result is the protection of young, untreated leaves and roots in whole cabbage plants. 57 Similar to spirotetramat‐enol (pK a = ), spiropidion‐enol has suitable physico‐chemical properties such as being a weak acid with a pK a value of , which results in phloem mobility (Fig. 12b,c). The weak acidic and lipophilic properties of. Spirotetramat, a spirocyclic tetronic/tetramic acid derivative, is a systemic insecticide developed for the control of sucking pests, including aphids [13, 14]. It can cause a significant. Natural Insecticides for Aphids. Aphids live their lives on the undersides of plant leaves, using their sharp jaws to suck out sap. By themselves, these soft-bodied insects cannot seriously harm. While aphids in general feed on a wide variety of plants, different species of aphids can be specific to certain plants. For example, some species include bean aphids, cabbage aphids, potato aphids, green peach aphids, melon aphids, and woolly apple aphids. Some aphids are darker colors, like brown. The potato aphid is a common brown aphid.
Dispose of infested plants: Remove heavily infested leaves and stems, and even whole plants that may serve as aphid reservoirs for the rest of your garden. Dispose of the infested plants in the trash or bury them deep in your compost pile. Control outdoor ants: Ants “farm” aphids to feed on the excreted honeydew and will protect the aphids from their natural enemies. The New Zealand Institute for Plant & Food Research Limited. Aphid trapping service - Scotland»~ yellow-bowl water traps serviced/week»Aphids identified to species»Web site on aphid flights/virus risk»Growers may respond with insecticides»Need information on virus & resistance incidence to decide on insecticide . Aphids are very common insects and are found on most plants in yards and gardens. In most cases they cause little or no damage to the health of plants. Signs of severe aphid feeding are twisted and curled leaves, yellowed leaves, stunted or dead shoots and poor plant growth. Treating aphids for the. Aphids, or plant lice, are tiny, 1/8-inch long insects that may come in green, red, brown or yellow. They feed on new plant growth by sucking the juices of the leaves, stems or buds. In great number, they can stunt growth and create an unhealthy appearance in plants. Gardeners can choose from a variety of pesticides to kill aphids on their plants.