By Marion Gratwick M.Sc, D.I.C., C.Biol., M.I.Biol., F.R.E.S. (auth.), Marion Gratwick M.Sc, D.I.C., C.Biol., M.I.Biol., F.R.E.S. (eds.)
Following the death of the MAFF's Perma a few leaflets to fill notable gaps. The nent Leaflet sequence in 1985, it was once prompt content material of 3 leaflets has been altered extra that the ultimate versions of the crop pest advisory generally. hence, Chafer grubs (Chapter 32) leaflets could be produced in a certain quantity now contains fabric from Leaflet 449, for the good thing about destiny agricultural entomolo jap beetle, which has been passed over from gists and others attracted to crop pests. This this assortment as this pest has now not turn into notion originated open air MAFF yet was once enthusi demonstrated in Europe. Nematodes on straw astically supported via entomologists in MAFF, berry (Chapter eighty one) has been enlarged through the the rural learn institutes and the uni addition of extra info on free-living versities. As editor of the leaflets from 1965 nematodes from the plant pathology leaflet on until eventually 1985, I provided to adopt the duty of Soil-borne virus ailments of fruit vegetation. The compilation and modifying, and this supply used to be joint plant pathology/entomology leaflet on authorised. Raspberry cane blight and midge blight has to avoid the publication from changing into fast been incorporated, however the details has been outmoded, the sections on regulate measures customarily limited to raspberry cane midge and feature been redrafted through the Advisory Entomol the identify replaced accordingly.
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Additional info for Crop Pests in the UK: Collected edition of MAFF leaflets
Those subject to severe attacks are aubergine, cucumber, dwarf French bean, pepper, tomato and a large Glasshouse whitefly 47 number of. ornamentals, including fuchsia, Gerbera, Pelargonium, poinsettia, primula, Solanum and occasionally chrysanthemum. Both the adults and the young suck sap from the foliage and, when present in large numbers, cause a general weakening of growth. In addition, the insects produce a sticky excretion known as honeydew, which covers the leaves and prevents them from functioning normally.
A systemic for aphids can be combined with a contact insecticide to control caterpillars, or a mixed product can be used. Summer sprays Infestations sometimes occur after the blossom period, usually because of the omission or failure of earlier sprays or because of reinfestation by winged forms of the green apple aphid. Although this species usually causes most trouble at this time, especially in the nursery and on young trees, the rosy apple aphid and the rosy leaf-curling aphid continue to infest young shoots.
Wheat is more tolerant to BYDV than are oats or barley. BYDV symptoms in barley are similar to those produced by nitrogen deficiency, acidity or waterlogging. Virusinfected plants, however, remain stunted even under optimum growing conditions. Not all cereal aphids transmit all virus strains. Many species can transmit BYDV, but in Britain only three species are thought to be important. The bird-cherry aphid is most important in southern England, while the grain aphid is more important in northern England.