Industrial hemp (Cannabis sativa L.) is a multifunctional crop that can be processed to obtain many different products like food, feed, cosmetics and pharmaceuticals, recyclable and compostable biomaterials, energy, while having a positive effect on the environment. As the world market for industrial hemp seeds and oil is on rise, research has been carried out in the climatic conditions of Central Moldova in order to obtain a new genotype of monoecious hemp in accordance with the requirements of the European market and beyond. Olivia is a new monoecious hemp variety for seed, created at Agricultural Research and Development Station Secuieni Neamț, being homologated in 2020. It was patented in 2021 and is registered in the Official European Catalog of Varieties. It was obtained by repeated hybridization (dioecious form Chi65 - female partner and monoecious form Z59 - male partner), isolation in space and repeated selection. This new variety is characterized by stems with a length of 2.6-3.2 m. The yield is of 9.5-11.0 tha-1 of stems and 1600-2000 kg ha-1of seed.
In the period 2019-2022, at A.R.D.S. Secuieni through the implementation of the ADER 2.2.1. project, the series of observations and determinations on appearance and evolution of harmful entomofauna in rapeseed, sunflower and corn crops continued. The pests monitoring was carried out by ground surveys with a metric frame (25/25 cm), yellow bowl traps, Barber and yellow glue traps from crop emergence until plants mature. The collected material was subjected to a mathematical analysis to calculate the ecological parameters: abundance (A), dominance (D), constancy (C) and the index of ecological significance (W) which highlight the characteristics of the analyzed biocenosis. Recorded data showed that in rapeseed, the harmful entomofauna included 20 pest species that totalled on average 1207 specimens per year, whose abundance had maximum values of 523 specimens/year at the species Ceuthorynchus pallidactylus. The rapeseed species were classified into four classes of dominance, four classes of constancy and five classes of the ecological significance index. In sunflower, the harmful entomofauna consisted of 16 species, which totalled an average of 504 specimens annually, with abundance values between 1 and 182 specimens. Of the 16 species, three were classified in the D5 dominance class, two in the D4 class, five in the D3 class, and six in the D1 class as well as in classes C1 and C2. In terms of the index of ecological significance, Harpalus sp. fell into the W3 class, the rest of species being into the W1 and W2 classes. In corn, the entomofauna was also composed of 16 species totalling an average of 3720 specimens/year. The species Diabrotica virgifera virgifera had the highest abundance (2388 specimens) classified in the class of D5 dominance, C3 constancy and W5 index of ecological significance. The entomofauna harmful to rapeseed, sunflower and corn crops is quite numerous in terms of species and specimens number, which requires permanent monitoring and the application of appropriate measures to prevent attacks and control.
"Rapeseed, the first crop established in autumn, is a species that attracts a large number of pests, from emergence to the siliquae formation and seed. Decreased production due to the attack of harmful insects can vary between 30-50%, in certain years, they can completely compromise crops. This paper presents data on the entomofauna harmful to rapeseed crops and the influence of measures to prevent and combat attacks, under specific conditions in the Central area of Moldova. The results obtained between 2017 and 2020 showed that the harmful entomofauna of rapeseed was composed of 23 species of insects, classified in five systematic orders: Coleoptera, Lepidoptera, Heteroptera, Hymenoptera and Homoptera. According to the number of species and the number of specimens collected, the order Coleoptera had the maximum share of 73.9% and respectively 88.9%. Within the order Coleoptera, the most abundant species were Phyllotreta atra (41.4%), Meligethes aeneus (27.8%), Ceuthorynchus assimilis (9.6%) and Phyllotreta nemorum (7.3%). Out of the total pest entomofauna, it was found that 30% affect rapeseed crops in the period between seed germination-plant emergence-leaf rosette formation, 9.1% in budding phase, 38% in flowering and 1.8% up to 2.8% in the phenophases of siliquae formation and seed. To prevent the attacks of soil pests (P. atra, P. nemorum, Psylliodes sp., Athalia rosae) was achieved by chemical treatment of the seed with Imidacloprid, Clothianidin and Thiamethoxam. The product Lumiposa 625FS-11.4 l/t seed was experimented with good results in seed treatment. To reduce the attacks of the pests during the flowering period (M. aeneus, A. rosae, Epicometis hirta, Ceuthorynchus assimilis) three treatments were applied on vegetation as follows: Decis Mega-0.075l/ha; Biscaya-0.3 l/ha; Mavrik-0.2 l/ha. This work was carried out within ADER 4.1.5 and 2.2.1 projects."
The Ostrinia nubilalis Hbn. larvae causes attacks and production losses by feeding with different parts of the plant (stem, cobs, inflorescence). The insect is spread throughout Romania, the frequency of attack is, on average, between 30.3% and 70%. The importance of Ostrinia nubilalis Hbn. attacks produced at maize led to the initiation of studies in 2017 at ARDS Secuieni with the purpose to establish the role of technological links in reducing the attack caused by insect larvae. The result obtained regarding the experimentation of five sowing epochs highlighted the high attack on larvae of maize sown in epochs IV and V in comparation with the optimal epoch. The attack produced by larvae at different genotype under the conditions of Central of Moldova, was between 28.59% (Turda 248) and 35.83% (Turda 165), compared with the average experience of 33.34%. Regarding the positioning of the attack on the plant, it is found that highest number of gallery were identified in the area under the cobs compared to the panicle area, where their number was much lower. The application of insecticides through treatments on vegetation reduced the attack of larvae ensuring the protection of maize plants, the variant treated with the active substance cyantraniliprol 200 g/l registered the lowest attack of 9.4%. In the variants treated with insecticides, the attack had values between 11.6% and 15.4% compared to the untreated variant, which registered an attack of 22.5%. In the period 2017-2020, under the conditions in Central Moldova, the sowing epoch and treatment with insecticides on vegetation significantly influenced the attack, and in terms of cultivated hybrid, the differences were insignificant.
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