scholarly journals The results of catching winged aphids with water traps on potato plantings in the southern part of the Arkhangelsk region

2021 ◽  
Vol 16 (3) ◽  
pp. 215-225
Author(s):  
Aleksey A. Shamanin ◽  
Valentina A. Korelina ◽  
Marina N. Berim ◽  
Lyudmila A. Popova
Keyword(s):  
Weather Conditions ◽  
Experimental Period ◽  
Pest Population ◽  
Protective Measures ◽  
Potato Aphid ◽  
Black Bean ◽  
Potato Plants ◽  
Arkhangelsk Region ◽  
Water Traps ◽  
Potato Crops

Dynamics of the number and species composition of aphids were studied on seed potatoes using yellow water traps in the southern part of the Arkhangelsk region in 2018-2019. 12 species of winged aphids (165 insects) were identified in 2018, and 16 species (115 insects) - in 2019. The following types dominated: black bean aphid A. fabae Scop., bird cherry-oat aphid R. padi L., blackcurrant-sowthistle aphid H. lactucae L., glasshouse-potato aphid A. solani Kalt. The share of aphids as direct and indirect vectors of viral diseases was 91 % of the total number in 2018, and 79.1 % in 2019. The pest population of potato plants depended directly on weather conditions of the growing season. The sum of the average daily temperatures during the period of catching aphids was 1273.3 C in 2018, and 983.3 C - in 2019. During the experimental period, 131.6 mm of precipitation fell in 2018, and 280.4 mm - in 2019. Due to the constant presence of aphids on seed potato crops, annual monitoring of pest population and, in case of necessity, protective measures are required.

WEEDS IN POTATO CULTURE AND THEIR OUTCOME IN SPREADING OF Alternaria spp.

2018 ◽  
Vol 17 (6) ◽  
pp. 159-166
Author(s):  
Halina Kurzawińska ◽  
Stanisław Mazur ◽  
Małgorzata Nadziakiewicz ◽  
Jacek Nawrocki
Keyword(s):  
Chenopodium Album ◽  
Potato Cultivar ◽  
Cirsium Arvense ◽  
Potato Plants ◽  
Potato Culture ◽  
Rapd Pcr ◽  
Microscopic Features ◽  
Weed Infestation ◽  
Pcr Method ◽  
Potato Crops

The aim of this study was to determine whether the weeds accompanying potato crops can be a source of Alternaria spp. causing Alternaria leaf blight and to determine the genetic similarities of Alternaria alternata isolates infecting selected weeds: Chenopodium album, Cirsium arvense and tested potato cultivar. Three-year field experiment was conducted on the potato cultivar ‘Vineta N’. The isolates were classified into different species on the basis of macro- and microscopic features. In each year of the study, A. alternata dominated among the isolated fungi colonizing the leaves of potato plants and the selected weeds. The genetic similarities of A. alternata isolates was determined by the RAPD-PCR method. Tested genetic forms of A. alternata were closely related; only small differences in the pattern of the separated amplification products was evidenced. The dominance of A. alternata on the weeds accompanying potato crops suggests that if weed infestation is extensive, the pathogen is very likely to spread and its population to increase.

scholarly journals Split fertilization as a strategy to reduce the amount of fertilizer applied in potato crops form Colombia. Case of study

2020 ◽  
Vol 14 (2) ◽  
pp. 240-248
Author(s):  
Oscar Iván Monsalve ◽  
Eduardo María Espitia ◽  
Martha Marina Bolaños-Benavides
Keyword(s):  
Soil Fertility ◽  
Potato Plant ◽  
Split Application ◽  
Potato Plants ◽  
Low Efficiency ◽  
Effect On Yield ◽  
Potato Crops ◽  
Positive Effect

In potato crops in Colombia, fertilization has low efficiency in terms of absorption of nutrients by the plant due to fixing, leaching or volatilization processes. To counter this phenomenon, we evaluated the effect of the split application of fertilizers on potato plants and soil. Five treatments were evaluated: Control - fertilization used by farmers locally; As - fertilization recommended by the lab; AsSplit - monthly split of lab recommendation; AsSplit25 - monthly split of lab recommendation, reduced globally by 25%; AsSplit50 - monthly split of the lab recommendation, reduced globally by 50%. AsSplit treatment generated the highest yield (34.13 t ha-1), while treatments that reduced the amount of fertilizer by 25% and 50% obtained the lowest yield (30.94 and 29.57 t ha-1, respectively). However, they generated the lowest amount of NO3- in the leachate measurements at 30 and 90 cm deep. Our results suggest that designing the fertilization formula and applying it according to the requirements of the potato plant and soil fertility generates a positive effect on yield crop and environmental.

scholarly journals Potato productivity depending on the use of plant growth regulator Agate-25K

2018 ◽  
pp. 162-165
Author(s):  
V. Semenchuk
Keyword(s):  
Plant Growth ◽  
Growth Regulator ◽  
Plant Growth Regulator ◽  
Biological Product ◽  
Potato Plants ◽  
Potato Crops

Shows the results of research on the use of a biological product of Agat- 25K in potato crops. It has been established that spraying with the preparation of potato plants during the period of vegetation positively influenced their productivity. The increase in yield from the application of the preparation was 4.2 t/ha, which is 12%, the number of tubers from the 1st bush was 4.1 pieces. more than control, where spraying was not carried out.

scholarly journals Potential possibilities of water retention in agricultural loess catchments

2016 ◽  
Vol 30 (1) ◽  
pp. 141-149 ◽  
Author(s):  
Tomasz Zubala ◽  
Magdalena Patro
Keyword(s):  
Spatial Planning ◽  
Water Retention ◽  
Soil Cover ◽  
Weather Conditions ◽  
Physical Parameters ◽  
Sample Analysis ◽  
Protective Measures ◽  
Economic Problems ◽  
Small Catchments

Abstract The growing water deficit and the increased demand for water, as well as economic problems and inadequate spatial planning in many regions indicate a necessity of developing more effective rules of programming and realisation of works concerning the water management in small catchments. The paper presents a sample analysis of the possibilities of increasing water retention in the agricultural loess catchments with periodic streams. The scope of the study included the determination of physical parameters of selected sub-catchments (geometry, soil cover, land use, etc.) and of the sources of threat to water resources, resulting from construction and geomorphological conditions. Pre-design assumptions of dammings were developed, taking into account anti-erosion protective measures, and treatments increasing the landscape retention of water were proposed. Creating surface retention objects should be an important source of water in simplified agroecosystems, especially in regions, where productivity to a great extent depends on natural weather conditions. Proper management of the fourth-order loess basin of the Ciemięga River (area of about 150 km2, the presence of 50 lateral valleys) could give a temporary reservoir retention reaching 500 thousand m3. Farmers should be encouraged to seek “own water sources” (including the accumulation of water within wasteland), using appropriate economic instruments (tax reliefs for the documented volume of retained water, e.g. in small retention reservoirs).

scholarly journals Time-Lag Effect Between Sap Flow and Environmental Factors of Larix principis-rupprechtii Mayr

Forests ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 971 ◽  
Author(s):  
Liu Hong ◽  
Jianbin Guo ◽  
Zebin Liu ◽  
Yanhui Wang ◽  
Jing Ma ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Meteorological Factors ◽  
Time Lag ◽  
Weather Conditions ◽  
Experimental Period ◽  
Northwest China ◽  
Thermal Dissipation ◽  
Time Lags ◽  
Sap Flux Density ◽  
Water Limitations

A time lag between sap flux density (Js) and meteorological factors has been widely reported, but the controlling factors of the time lag are poorly understood. To interpret the time lag phenomenon systematically, thermal dissipation probes were placed into each of eight trees to measure the Js of Larix principis-rupprechtii Mayr. in the Liupan Mountains in Northwest China. Meteorological factors, including vapor pressure deficit (VPD), solar radiation (Rs) and air temperature (Ta), were synchronously measured with Js, and the dislocation contrast method was used to analyze the time lag between Js and the meteorological factors. The analysis indicated the following for the whole experimental period. (1) The time lag between Js and VPD (TLV) and the time lag between Js and Rs (TLR) both exhibited different patterns under different weather conditions, and Js could precede Rs on dry days. (2) Both TLV and TLR varied with the day of the year (DOY) throughout the experimental period; namely, both exhibited a decreasing tendency in September. (3) Reference crop evapotranspiration (ETref) had a greater influence on the time lag than the other meteorological factors and directly controlled the length and direction of TLV and TLR; relative extractable water (REW) modified the relationship between ETref and time lag. (4) The regression analysis results showed differences between the time lags and the environmental factors (ETref and REW) within different ranges of REW. Namely, TLR was better determined by ETref and REW when REW < 0.38, while TLV was better correlated with ETref and REW in the absence of soil water limitations (REW > 0.38). This project provided an important opportunity to advance the understanding of the interaction between plant transpiration and meteorological factors in a changing climate.

scholarly journals Interrupted Wet Period (IWP) to Forecast the Aerial Alternaria in Potato Crops of A Limia (Spain)

Agronomy ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 585 ◽  
Author(s):  
Meno ◽  
Escuredo ◽  
Rodríguez-Flores ◽  
Seijo
Keyword(s):  
Early Blight ◽  
Potato Crop ◽  
Alternaria Solani ◽  
Weather Conditions ◽  
Economic Losses ◽  
Risk Of Infection ◽  
Climate Conditions ◽  
Crop Cycle ◽  
Minimal Environmental Impact ◽  
Potato Crops

Potato early blight caused by Alternaria solani generates significant economic losses in crops worldwide. Forecasting the risk of infection on crops is indispensable for the management of the fungal disease, ensuring maximum economic benefit but with minimal environmental impact. This work aimed to calculate the interrupted wet periods (IWP) according to the climate conditions of A Limia (Northwest of Spain) to optimize the prediction against early blight in potatoes. The study was performed during nine crop cycles. The relative hourly humidity and Alternaria concentration in the crop environment were taken into account. Alternaria levels were monitored by aerobiological techniques using a LANZONI VPPS-2000 volumetric trap. The relationships between weather conditions and airborne Alternaria concentration were statistically analyzed using Spearman correlations. To establish the effectiveness of wetness periods, the first important Alternaria peak was taken into account in each crop cycle (with a concentration greater than 70 spores/m3). Considering the six interrupted wet periods of the system, it was possible to predict the first peak of Alternaria several days in advance (between 6 and 38 days), except in 2007 and 2018. Automated systems to predict the initiation of early blight in potato crop, such as interrupted wet periods, could be an effective basis for developing decision support systems. The incorporation of aerobiological data for the calculation of interrupted wet periods improved the results of this system.

scholarly journals Constructive basis for the development of the extreme zones of Siberia and the Russian arctic

2018 ◽  
Vol 7 (2.13) ◽  
pp. 75
Author(s):  
Tat'yana Sarvut
Keyword(s):  
Structural Changes ◽  
Irreversible Process ◽  
World Ocean ◽  
Weather Conditions ◽  
Russian Arctic ◽  
Protective Measures ◽  
New Approach ◽  
The World ◽  
The Face ◽  
New Type

The paper describes the constructive basis for building and structure designing in the difficult regions of Siberia and the Russian Arctic and development of a new approach to the design of buildings and structures in the Russian Arctic in the face of climate change. Severe climate and weather conditions of the northwestern territories of Russia are rapidly changing due to the global warming. The structural changes in development and construction, following this irreversible process, are highlighted and discussed in relation to the foundations and constructive systems. The paper provides an overview of methods and technological approaches to the extreme zone construction. The application of modern methods of design and construction with the involvement of competent "practitioners" increases the pace of construction and reduces its cost; Architectural and constructive solutions should focus on the developing areas of business and tourism. We suggest the possible protective measures against the transgression of the World Ocean and thawing of the permafrost. The term “special Arctic bases”, denoting the new type of settlements in the Russian Arctic, is introduced. The introduction of constructive solutions and the development of planning solutions for the bases will help to ensure a stable activity in the region.  

scholarly journals Effect of pirimicarb application on field ppulations of Myzus persicae (Sulz.) (Homoptera: Aphididae) with different esterase levels

2000 ◽  
Vol 29 (4) ◽  
pp. 739-747
Author(s):  
Rui S. Furiatti ◽  
Sonia M. N. Lázzari
Keyword(s):  
Myzus Persicae ◽  
High Frequency ◽  
The Other ◽  
Biochemical Tests ◽  
Crop Season ◽  
High Frequencies ◽  
Potato Plants ◽  
Before And After ◽  
Potato Crops ◽  
Selection Of

The frequency and intensity of Myzus persicae (Sulz.) resistance were studied using bioassays and biochemical tests in two potato crops in Ibicoara, Bahia. Both areas received several insecticide applications which failed to control M. persicae. By the end of the crop season, one of the areas received two applications of pirimicarb and the other was not sprayed. Six samples of 700 aphids each were randomly collected before and after the pirimicarb applications, with an interval of four days. Specimens of M. persicae were also collected from isolated potato plants. At the laboratory, the samples were characterized by the CL50 based on insecticide bioassays and by total esterase activity using colorimetric assays. After the pirimicarb applications, the susceptible (S), the moderate resistant (R1) and mixed S/R1populations presented decreasing resistance frequencies (from 36.6 to 9.9; 12,0 to 7.5 and 11.4 to 5.9%, respectively). On the other hand, high resistant individuals (R2), extremely resistant (R3), and mixed populations of R1/R2 had increasing frequencies (from 17.7 to 36.7%; 2.3 to 9.1%, and 20.0 to 30.8%, respectively). The survival of S individuals was probably due to their wandering behavior on the plants to avoid sprayed areas. All changes in frequency were reflected in the LC50 and in the resistance ratio (rr). In the pirimicarb untreated area, high frequencies of R2, R3 and R1/R2 were observed. High frequency and resistance intensity of M. persicae in areas under intensive insecticide applications can be related to the selection of resistant populations and due to the entrance of winged migrants from spontaneous plants, where the frequency of R2+R3 was 81.4%.

scholarly journals Особливості біології оленки волохатої (Epicometis Hirta Poda.) та заходи обмеження її шкідливості в промислових насадженнях суниці в зоні лісостепу України

2015 ◽  
pp. 36-40
Author(s):  
Ю. П. Яновський ◽  
С. В. Cуханов ◽  
С. В. Cуханов ◽  
Л. П. Михайленко ◽  
Є. В. Чепернатий
Keyword(s):  
Soil Surface ◽  
Steppe Zone ◽  
Forest Steppe ◽  
Pest Population ◽  
Potential Production ◽  
Protective Measures ◽  
Industrial Plants ◽  
Plant Remains ◽  
The Right

Наведено результати досліджень з уточнення біо-логічних особливостей оленки волохатої (Epicometishirta Poda.) в промислових насадженнях суниці в зонілісостепу України. Встановлено, що жуки літаютьу теплі сонячні дні, найбільш інтенсивно з 10 годиниранку до 15 години дня, а вже після 18 години вечората в прохолодні ночі жуки ховалися в ґрунт на глиби-ну 0,5–2,5 см. Фітофаг пошкоджував рослини суниціз фази «висування квітконосів» до закінчення фази«закінчення цвітіння і утворення зав’язі», не надаючиособливої переваги їх сортовому походженню. Пару-вання особин розпочиналося відразу після виходу жу-ків на поверхню ґрунту і тривало до закінчення льотуімаго. Впродовж першої половини травня–кінець червнявідбувалося активне відкладання яєць шкідником уґрунт на глибину до 35 см. Потенційний запас однієїсамиці (у 2–3 прийоми) досягав 34–44 яєць; вона від-кладала по 12–17 яєць у ґрунт у декількох місцях. Від-родження личинок з яєць спостерігалося в ІІ-й декадітравня і тривало до кінця ІІІ-ї декади липня. Личинкижили в ґрунті до кінця серпня–початку вересня і жи-вилися рослинними рештками. Заляльковування роз-починалося з кінця серпня і тривало до половини ве-ресня. Через 15–20 днів з’являлися молоді жуки, щозалишалися зимувати в ґрунті (на необроблених ділян-ках) до весни наступного року. За відсутності прове-дення захисних заходів до 93 % квіток рослин у насад-женнях було пошкоджено цим видом, їх врожайністьзнижувалася до 65 %. Для зниження чисельностіцього виду необхідно застосовувати інсектициди«Моспілан», РП (0,2 кг/га) та «Каліпсо» 480 SC, КС(0,25 л/га).        It is showed the results of studies where the biological peculiarities of Epicometis hirta Poda. are ascertained in industrial plants of strawberries in the right bank of Forest Steppe zone of Ukraine.       It is established that beetles fly in warm sunny days the most intense from 10 a.m. to 15 p.m. and after 18 p.m. and in cool nights beetles hide in the soil in the depth of 0,5–2,5 cm.  Pest has started to harm plants of strawberry starting of phase «nomination of peduncles» to the end of phase «end of flowering and the formation of ovaries» without any preferring of varietal origin. Copulation of individuals was started immediately after beetles appearing on the soil surface and lasted until the end of the adults fly. During the first half of May till the end of June active pests’ eggs laying in the soil on a depth of 35 cm was observed. The potential production of one female (2–3 hours) has reached 34–44 eggs, she postponed 12–17 eggs in the soil in several places. Larvae hatching from eggs was observed in II-decade of May and continued until the end of the III decade of July. The larvae lived in the soil by the end of August – early September and was fed by plant remains. The pupation phase was started from the end of August and lasted until half of September. After 15-20 days there were young beetles that stayed wintering in the soil (in untreated plots) till the next spring. In time of absence of protective measures to 93 % of flower of  plants in plantations were damaged by this pest, their productivity was reduced to 65 %.         For decrease of this pest population it is required to apply insecticide Mospilan, RP (0,2 kg/ha) and Calipso 480 SC, (0,25 l/hа).

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