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  • Author: Stelica Cristea x
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Elena Ichim, Luminita Marutescu, Marcela Popa and Stelica Cristea

Abstract

Control of plant bacterial diseases remains difficult due to the limited availability of efficient plant protection products with reduced negative effects either in the environment or with human and animal health. In order to reduce the usage of chemical pesticides alternative strategies for controlling plant pathogens and improve plant disease resistance are promoted. The aim of the study was to investigate the antibacterial activity of some natural compounds (plant extracts of Tamarix ramosissima, Rosmarinus officinalis, Chelidonium majus, Silybum marianum, Satureja hortensis essential oil and propolis) against bacterial ring rot pathogen, Clavibacter michiganensis ssp. sepedonicus (Cms). An agar diffusion method was used for the screening of the inhibitory effect of natural compounds on bacterial strains’ growth. Minimum inhibition concentrations (MICs) were determined by a twofold serial dilution method. The anti-pathogenic activity was investigated by the study of anti-biofilm activity of natural substances. The analyzed natural substances showed a good microbicidal activity and anti-biofilm activity. The results obtained from this study may contribute to the development of new bio-control agents as alternative strategies for prevention and control of ring rot pathogen.

Open access

Dumitru Manole, Vasile Jinga, Ana Maria Giumba, Roxana Dudoiu and Stelica Cristea

Abstract

At Sport Agra in Amzacea, in the last few years there have been experimented new sunflower and sorghum crop technologies designed to face the current climate changes. These technologies for the intended crops include the following elements: changing the sowing epoch with one month before the usual period recommended by classical technologies; application of herbicides in order to control both weeds and Orobanche cumana Wallr. parasite in plots cultivated with various hybrids from Syngenta and Limagrain companies; application of last generation fungicides during the vegetation period, which will reduce the attack of the main crop pathogens; screening of hybrids with good behavior towards the main pest agent of area - Orobanche cumana parasite, which cause important yield losses in the south east past of Romania. There were tested 8 hybrids from Syngenta Company, 6 hybrids from Limagrain and 4 hybrids from NARDI Fundulea. The yields obtained for most of the hybrids were over 4 t/ha. For sorghum crop, there were performed various experiments such as: changing the sowing period - beginning of April in order to benefit from the soil’s humidity at 4-5 cm depth boosting the germination process; choosing early hybrids in order to avoid the drought season which starts in June; applying adequate crop protection treatments, with pre-emergent and postemergent herbicides and last generation insecticides. The obtained production from sorghum crop were over 10 t/ha for most of the varieties tested.

Open access

Cristian Florinel Cioineag, Roxana Horoias and Stelica Cristea

Abstract

This study analyzes the results obtained during the agricultural year 2015-2016 on the PHD thesis research field and was carried out on a series of 6 wheat varieties (Triticum aestivum L.), of which 5 Premium wheat varieties and one Class A variety. The purpose of this research is to stimulate the expansion of Premium wheat varieties surfaces in Romania. Due to the superior quality of the grains (protein> 14.5%) their use in bakery, will reduce the use of synthesis enhancers. The location of the experimental field was carried out in Draganesti-Vlasca area, at SCDA Teleorman. The aim was to establish optimal technology to maximize the quantity and quality of the yield. Given the crop rotation after peas, the behavior of the wheat varieties was observed on different nitrogen doses. There were applied 3 fertilization fractions with nitrogen (N1-N3) and 3 treatments with fungicides (V1-V3). Determinations of the main foliar and spike diseases were made. The correlation between fertilizer and fungicide treatments showed the differences between yield potential and disease tolerance of the analyzed varieties.