Control measures for whiteflies and green aphids

control measures for whiteflies and green aphids Blog

Whitefly

Or strawberry aleurodide severely damages strawberries – especially in shaded, weedy garden plots. Adults hibernate – small, pale yellowish insects, whose wings are densely covered with white waxy pollen. Adult females live 25-30 days and during this time they manage to lay up to 130 eggs on the underside of the leaves, which are placed in rings of 10-20 pieces. The pale green larvae hatched from them immediately stick to the leaves. They, like adult insects, suck the juice from the leaves, resulting in small yellowish spots that contaminate the leaves with sugary secretions. A black sooty fungus subsequently settles on them, it causes yellowing and falling of the leaves – and a general oppression of the plant occurs.

The whitefly develops and multiplies very quickly: during the summer, 3-4 generations of the pest change. Especially in the presence of heat and moisture: in greenhouses, greenhouses and small-sized film shelters. Be careful when buying seedlings from greenhouses infested with whitefly (also called greenhouse), as you can bring the pest to your site. It severely damages tomatoes and somewhat less damages cucumbers. Pest control measures in the form of spraying with preparations have little effect, since sensitive, light butterflies take off at the first breath of the wind, and even more so with a pressurized jet of the preparation. It is better to use the following method. Since insects prefer yellow, 30×30 cm squares (made of plywood, hardboard, thick cardboard) painted with yellow paint are placed above the rows of plants. The surface is lubricated with technical vaseline, grease or other sticky fat. Whitefly butterflies fly to bright squares, stick to their surface – and die. For greater effect, you need to wave something over the surface of the plants to scare the butterflies, forcing them to fly in the direction of the squares.

Green aphids on fruit trees

green aphid

Causes great harm to the apple tree, pear, quince, hawthorn, mountain ash, shadberry, dogwood. Adult pests are green, about 2 mm long. Black, shiny aphid eggs overwinter on young shoots at the base of the buds and on coppice tops. During the period of swelling and budding, brownish-green larvae (0.5 mm) are born from eggs. They accumulate on the tops of the buds and suck the juice of plants, and when the buds loosen, they crawl inside. After bud break, the larvae move to the underside of the leaves and to green shoots. Damaged leaves curl up and cover the larvae and adult aphids. The shoots stop growing, bend, their tops curl and dry out. In the second half of summer, the feeding places of aphids are covered with a black, soot-like coating. The ubiquitous ants scurry around these canteens, feeding on the sweet secretions of aphids.

The larvae grow rapidly and after 12-15 days already turn into founding females, which hatch larvae without fertilization, creating new colonies of aphids. Over the summer, aphids give 10-17 generations! At the beginning of summer, winged female settlers appear, which, flying around the garden, infect new plants.

Prevention and control of aphids

So how to save the garden from this nightmare, what measures to take against them? Above all, protect ladybugs and lacewings, whose larvae feed on aphids. Be sure to cut the root shoots and tops of old apple trees on which aphid eggs hibernate (in early spring, before bud break, they can be destroyed by washing the boles and twigs with hot (80 degrees) water. During the growing season, use the following method: spray the plants with tobacco infusions with wood ash, greater celandine, tansy, garlic husks, onions, dandelions, potato tops, chemical means: antitlin, decis.They can be used only at the beginning of bud break, so as not to kill beneficial insects that go hunting before flowering.Be careful • Use chemicals only when there is a large accumulation of aphids on any crop. When spraying, try to treat the underside of the leaves where the aphid colonies are. Against aphids, caterpillars, ticks, a new biological preparation Bicol is also used.

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