Abstract
During 2014-2017, 22 species were identified in the yellow bowl trap type installed in winter rapeseed crops established at A.R.S.D. Secuieni. Of these, 11 species are specific to winter rapeseed crops and 11 species were accidental identified because of the proximity with different agricultural crops (maize. sunflower. grain cereals). The highest abundance was registered by Epicometis hirta Poda species which accounted 914 specimens collected during the analyzed period. The species were integrated into classes of dominance ((D1 - subrecedent species. D2 - recedent species. D3 - subdominant species. D4 - dominant species and D5 - eudominant species). Meligethes aeneus F., Ceuthorrhyncus napi Gyll. and Epicometis hirta Poda. being considered eudominant species belonging to the D5 class. The Ceuthorrhynchus napi Gyll., Meligethes aeneus F., Epicomites hirta Poda., Psylliodes chrysocephala L., Subcoccinella 24 punctata L., Oulema melanopa L. species were classified in the constancy class - C4 - euconstant species. Meligethes aeneus F., Epicometis hirta Poda and Ceuthorrhynchus napi Gyll. species recorded the highest values for the index of ecological significance (W %) and were classified in the W5 class - characteristic species. The collected entomofauna belongs to five orders: Coleoptera, Heteroptera, Lepidoptera,. Diptera and Hymenoptera. The highest number of species (17 species) and the highest number of collected speciemens (3246 specimens) belonged to the Coleoptera order.
Highlights
Rapeseed crops involves a careful plant surveillance because it is one of the most ssusceptible crop to pest attack throught the phenological development of plants
From the observations and determinations carried out on the entomofauna collected from winter rapeseed crops, it was found that it was made up of 22 species that totalized over the entire observation period (2014-2017) 3447 specimens (Table 1)
There were found other species of insects, which have been categorize as accidental species coming from proximity crops: Ostrinia nubilalis Hbn., Chlorops pumilionis Bjerk., Tanymecus dilaticollis Gyll., Crepidodera ferruginea Scopoli., Oscinella frit L., Oulema melanopa L., Eurygaster spp., and entomophagus species (Subcoccinella 24 punctata L.)
Summary
Rapeseed crops involves a careful plant surveillance because it is one of the most ssusceptible crop to pest attack throught the phenological development of plants. Knowing the harmful species, which by attacking the different plant organs (leaves, stem, floral buds, flowers) leads to low productions of poor quality, it is important because teoretical knowledge combined with practical knowledge ensure the establishment of the suitable treatment moment [1-7]. The researches conducted to identify the pest atack correlated with influence of zonal agroecological factors has led to the establishment of the climate changes impact on winter rapeseed crops entomofauna. The drought which appears more frequently in the spring and summer months, the succession of high temperatures and low *. Rainfall periods, especially in the winter months, determine the insect hibernation period to shorten causing great problems through the aggressive attacks and high densities of the key species.
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