Papers in Press

Papers in press are accepted peer-reviewed papers published online in manuscript form, but which have not been copyedited and not yet appeared in a regular issue of the journal. Copyediting may lead to small differences between the papers in press version and the final version, therefore please note that titles and content are liable to change during preparation for publication.

These papers should be cited in the following form:
Balodis, O., Gaile, Z. 2011. Fungicide as growth regulator application effect on winter oilseed rape (Brasscia napus L.) autumn growth. Agraarteadus/Journal of Agricultural Science (in press).


Külli Hiiesaar, Viacheslav Eremeev, Ingrid H. Williams  
  THE RELIABILITY OF COLORADO POTATO BEETLES (LEPTINOTARSA DECEMLINEATA SAY) POPULATION DENSITY PREDICTIONS BASED ON PHENOLOGICAL AND OVERWINTERING DATA (6) In Press
 
Abstract
THE RELIABILITY OF COLORADO POTATO BEETLES (LEPTINOTARSA DECEMLINEATA SAY) POPULATION DENSITY PREDICTIONS BASED ON PHENOLOGICAL AND OVERWINTERING DATA
Külli Hiiesaar, Viacheslav Eremeev, Ingrid H. Williams

On the basis of phenological observations and over­wintering mortality data in 2015/2016 we tried to predict the population density of Colorado potato beetle (Leptinotarsa decemlineata Say) (CPB) for the following season. Because of the late and cool spring in 2015, the beetles started to emerge from the soil at the end of May and, because of the low temperatures, did not start to reproduce immediately. The first egg clutches did not appear until the end of June. The low density of larvae and beetles in mid-summer lead us to expect low damage for the whole season. However, very warm weather in August and September induced the beetles to lay eggs and the population density increased sharply. A lot of the summer beetles managed to terminate their development in time and to dig into the soil for overwintering. Consequently, we expected the beetles to be abundant the following spring. However, a short, snowless, very cold period in January when air temperature fell to –30 °C and soil temperature to –6.6 °C nullified this prediction as over 90% of over­wintering beetles perished. In spring 2016, very few beetles were found on the field and the potato plants remained undamaged until the end of June. Then, due to south-east storms at the end of June, very large migrations occurred and, some weeks later, various development stages of CPB were very abundant in potato fields. Thus, none of our predictions came true. The main reason for this was our extremely unstable weather conditions during summer and the overwintering period and the unpredictable large migrations from southern regions.
Keywords: population density, prediction, phenology, overwintering, weather conditions.
Source: Agraarteadus 2017 (28) 1:In Press

Print

OTSELINK
http://agrt.emu.ee/pdf/2017_1_hiiesaar_inpress.pdf
AUTORI KONTAKT
Estonian University of Life Sciences, Institute of Agricultural and Environmental Sciences Kreutzwaldi 5, Tartu 51014
 
 
Budi Winarto, Muhammad Prama Yufdy  
  ESTABLISHMENT OF IN VITRO PROPAGATION PROTOCOL OF GERBERA JAMESONII BOLUS EX HOOK F.: EXPLANT AND MEDIA SELECTION TO PLANTLET ACCLIMATIZATION (0) In Press
 
Abstract
ESTABLISHMENT OF IN VITRO PROPAGATION PROTOCOL OF GERBERA JAMESONII BOLUS EX HOOK F.: EXPLANT AND MEDIA SELECTION TO PLANTLET ACCLIMATIZATION
Budi Winarto, Muhammad Prama Yufdy

Gerbera (Gerbera jamesonii Bolus ex Hook f.) is an important ornamental plant commodity with high economical value in Indonesia; however, development of the plant in larger scale commercially is constrained by the availability of qualified-planting materials. Conventional propagation is clearly not suitable to overcome the problem and therefore in vitro propagation protocol is importantly addressed. In vitro propagation protocol of G. jamesonii was successfully established in the study. Different explants (shoot tips, young leaves, petioles and petals) were selected and cultured on Murashige and Skoog (MS) basalt medium containing different plant growth regulators. Shoot tips and half-strength MS medium containing 1.5 mg l-1 thidiazuron (TDZ) and 0.25 mg l-1 N6-benzylaminopurine (BAP) were suitable explant and initiation medium for shoot formation with 75% explant regeneration and 5.5 shoots produced per explant. Shoots derived from selection stage were proliferated on half-strength MS medium supplemented with 0.25 mg l-1 BAP and resulting higher shoot regeneration up to 7.5 shoots produced per shoot with 22.8 leaves and 0.83 cm leaf length. Multiplication of shoots on the half-strength MS medium fortified by 0.25 mg l-1 BAP increased gradually from the first subculture till the fifth subculture with 9.1 shoots produced per shoot subcultured and reduced thereafter. Shoots were then rooted on half-strength MS medium augmented with 0.5 mg l-1 α-naphthalene acetic acid (NAA) and 1.5 g l-1 activated charcoal (AC) and produced 2.1 roots per shoot with 2.52 cm length of roots. Well-rooted shoots were acclimatized in a mixture of burned-rice husk and organic manure (1:1, v/v) with 95% survival rate and 114 plantlets grew well under this treatment.
Keywords: explant, basalt medium, plantlet, propagation, shoot,  Gerbera jamesonii.
Source: Agraarteadus 2017 (28) 1:In Press

Print

OTSELINK
http://agrt.emu.ee/pdf/2017_1_winarto_inpress.pdf
AUTORI KONTAKT
Indonesian Ornamental Crops Research Institute, Jln. Raya Ciherang, PO. Box 8, Sdl, Pacet-Cianjur 43253, West Java-Indonesia. Phone no: +6285318815574.
 
 
Cloud of Keywords
2017_1_winarto_inpress beetles bolus colorado density development explant following gerbera growth half hook however jamesonii june leptinotarsa medium overwintering phenological plant plantlet population potato predictions produced propagation protocol selection shoot shoots soil spring strength summer vitro weather


 

PUBLISHER

APS

Estonian Academic Agricultural Society

Editor in Chief

Alo Tänavots

Address

Fr. R. Kreutzwaldi 1,
51014 Tartu,
Estonia

E-mail

SUPPORT

INFO

p-ISSN
1024-0845
e-ISSN
2228-4893

Agronomy 
1921-1944

Re-established 
Agraarteadus : Journal of Agricultural Science 1990

Online since 
1997 * VIII * 4

Indexed 
AGRIS, AGRICOLA, CABI, CABI Full Text, DOAJ, EBSCO

VISITORS


 
 
 
Follow us on Facebook