scholarly journals Weevils of the genus Ceutorhynchus germ associated with oilseed rape in northern Serbia

2015 ◽  
Vol 30 (3) ◽  
pp. 155-159 ◽  
Author(s):  
Ivan Sivcev ◽  
Lazar Sivcev ◽  
Snezana Pesic ◽  
Draga Graora ◽  
Vladimir Tomic ◽  
...  
Keyword(s):  
Oilseed Rape ◽  
Stem Elongation ◽  
Primary Target ◽  
Insecticide Treatment ◽  
Weevil Species ◽  
Ceutorhynchus Napi ◽  
New Generation

Our research of the genus Ceutorhynchus associated with oilseed rape was conducted in northern parts of Serbia (Stari Zednik, Subotica). A specific assemblage of eight weevil species was found. The most numerous were stem weevils Ceutorhynchus napi with 81% of all trapped specimens, followed by C. pallidactylus with 18%. The remaining six weevil specimens were C. obstrictus, C.erysimi, C. minutus, C. picitarsis, C. sulcicollis and C. typhae, comprising 1% of all trapped insects. Stem weevils C. napi and C. pallidactylus began to immigrate into the oilseed rape fields in autumn, as early as November 10 (BBCH 17-18). The maximum flight was recorded at the beginning of oilseed rape stem elongation (BBCH 22-25) on March 23. A new generation of C. pallidactylus emerged from oilseed rape fields in June (BBCH 76-88), while individual specimens occurred during the autumn. The majority of C. napi emerged in March next year, sporadically until May 7. As a consequence of C. napi dominance insecticide treatment should be performed earlier than usual, i.e. when C. pallidactilus is the primary target.

scholarly journals Phenology and suppression of stem weevils (Ceutorhynchus napi gyllenhal and Ceutorhynchus pallidactylus marsham) in oilseed rape in northern Serbia

2018 ◽  
Vol 33 (3-4) ◽  
pp. 213-220
Author(s):  
Lazar Sivcev ◽  
Ivan Sivcev ◽  
Draga Graora ◽  
Snezana Pesic ◽  
Vladimir Tomic ◽  
...  
Keyword(s):  
Oilseed Rape ◽  
Stem Elongation ◽  
Early Spring ◽  
Insecticide Treatment ◽  
Brassicogethes Aeneus ◽  
New Findings ◽  
Main Period ◽  
Ceutorhynchus Napi ◽  
Ceutorhynchus Pallidactylus ◽  
New Generation

Stem weevils (Ceutorhynchus pallidactylus and Ceutorhynchus napi) are significant pests of oilseed rape that farmers regularly suppress by insecticide treatments intended against Brassicogethes aeneus. Recent studies have shown that in some regions of northern Serbia C. napi is dominant, while C. pallidactylus prevails in others. Increased damage from stem weevils has elicited an exploration of the situation and a study of their phenology and effects of insecticides in three differently managed fields: conventional, organic and integrated. New findings regarding the phenology of stem weevils show that both species were sporadically present in our experimental oilseed rape fields as early as during autumn (from the end of October 2010, BBCH 17-18). The main period of stem weevil settlement is the end of winter and early spring. Maximum flight of both weevil species was recorded on March 23 at the beginning of oilseed rape (OSR) stem elongation (BBCH 22-25), and one week later in the organic field. There were no significant differences in the number of settled weevils among the three differently managed fields. The insecticide treatment against C. napi was applied two weeks earlier than the usual treatment against B. aeneus and C. pallidactylus. Thus, it is clear that insecticide treatment directed against B. aeneus and C. pallidactylus is not effective against C. napi. In this way, such a practice can contribute to an increase in OSR damage, and density of the next generation of C. napi. A new generation of C. pallidactylus emerged from OSR fields in June 2011, while the majority of C. napi emerged in March of the following year.

Critical phosphorus concentrations in oilseed rape (Brassica napus) and Indian mustard (Brassica juncea) as affected by nitrogen and plant age

1991 ◽  
Vol 31 (1) ◽  
pp. 107 ◽  
Author(s):  
A Pinkerton
Keyword(s):  
Oilseed Rape ◽  
Stem Elongation ◽  
Indian Mustard ◽  
Critical Values ◽  
Plant Age ◽  
Sand Culture ◽  
Mustard Seed ◽  
P Deficiency ◽  
N Supply ◽  
Oil Concentration

Oilseed rape and Indian mustard were grown in sand culture experiments in a glasshouse to derive values for a tissue test for the diagnosis of phosphorus (P) deficiency. Seven rates of P, combined factorially with 3 rates of nitrogen (N), were used to determine critical P concentrations. Suitable tissues to sample for a diagnostic test were the whole shoot of both species at any stage, or the youngest fully expanded leaf of rape and leaves 4-6 of mustard at the rosette stage. Critical P concentrations depended on both plant age and N supply. The critical values reported here for rape agreed closely with critical values found previously in tissues of field-grown crops of similar phenological age. Critical P levels in whole rape shoots adequately supplied with N decreased from 0.29% at the early rosette stage to 0.21% at the late rosette or yellow bud stage, while critical values in mustard fell from 0.25% at the early rosette stage to 0.18% at stem elongation to full flower. Critical P concentrations for prediction of seed yield were slightly higher (0.05% higher at the rosette stage). A nutrient supply with high P and high N reduced the seed oil concentration of both species; a low P and high N supply reduced the oil concentration in rape seed but increased it in mustard seed.

scholarly journals Effects of insecticides intended for Ceutorhynchus napi Gyll. control in oilseed rape on ground beetles

2017 ◽  
Vol 32 (3-4) ◽  
pp. 223-230 ◽  
Author(s):  
Lazar Sivcev ◽  
Ivan Sivcev ◽  
Draga Graora ◽  
Vladimir Tomic ◽  
Boris Dudic ◽  
...  
Keyword(s):  
Oilseed Rape ◽  
Management Practices ◽  
Soil Surface ◽  
Ground Beetles ◽  
Management Systems ◽  
Weed Cover ◽  
Ceutorhynchus Napi ◽  
Harmful Species ◽  
Harmful Effects ◽  
Amara Aenea

The effects of insecticides that are commonly used for conventional and integrated oilseed rape (OSR) management on ground beetles were studied. Monitoring of harmful species showed that only insecticides intended against Ceutorhynchus napi should be applied. There were no differences in beetle numbers and phenology of settling of C. napi in the OSR fields that received different management practices. The type of OSR management has a primary and significant impact on ground beetles abundance. Early in the spring, ground beetles settled more massively on the non-tilled OSR field with abundant weed cover and mulch on soil surface. However, there were no significant differences in species richness between the OSR fields managed differently. A total of 22 species were recorded. Early in the spring, the granivorous ground beetles Amara aenea (47.3%) and Harpalus distinguendus (32.5%) were dominant. When insecticides were applied, immigration of ground beetles began, so that their adverse effect was minimal. In both management systems the number of ground beetles and their diversity increased after spraying. In conclusion, no significant harmful effects of the insecticides on ground beetles were detected in OSR fields managed in two different ways.

scholarly journals Evaluation of nine genotypes of oilseed rape (Brassica napus L.) for larval infestation and performance of rape stem weevil (Ceutorhynchus napi Gyll.)

PLoS ONE ◽  
2017 ◽  
Vol 12 (7) ◽  
pp. e0180807 ◽  
Author(s):  
Heike L. Schaefer ◽  
Haiko Brandes ◽  
Bernd Ulber ◽  
Heiko C. Becker ◽  
Stefan Vidal
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Brassica Napus L ◽  
And Performance ◽  
Ceutorhynchus Napi

Dry matter production of oilseed rape (Brassica napus) with special reference to the root system

1994 ◽  
Vol 123 (3) ◽  
pp. 327-332 ◽  
Author(s):  
C. G. Kjellström ◽  
H. Kirchmann
Keyword(s):  
Growth Rate ◽  
Root Growth ◽  
Surface Area ◽  
Oilseed Rape ◽  
Root Length ◽  
Dry Matter ◽  
Stem Elongation ◽  
Root Surface ◽  
Root Surface Area ◽  
Root Radius

SUMMARYAt the research farm of the Swedish University of Agricultural Sciences, Uppsala, above- and belowground production and changes with time in root length, mean root radius and root surface area of spring oilseed rape were studied during the growing seasons 1987 and 1990. In both years, the highest root growth rate was recorded during the stem elongation phase, and the highest shoot growth rate during flowering. The root: shoot ratio decreased throughout the whole period of root sampling, from 0·64 to 0·16, during the cool and wet first year. In the warmer and drier second year, the ratio increased to a maximum of 0·72 when flowering started, and thereafter decreased. More than 80% of the root dry matter was found in the topsoil. Roots were longer and thinner in the dry and warm 1990 than in the wet and cool 1987. Maximum root length was c. 4·9 km/m2 in 1990, and mean root radius varied between 01 and 0·7 mm. Increases in root surface area during periods of root growth were due to increased root length rather than to increased mean root radius.

Ensemble-based analysis of regional climate change effects on the cabbage stem weevil (Ceutorhynchus pallidactylus (Mrsh.)) in winter oilseed rape (Brassica napus L.)

2011 ◽  
Vol 150 (2) ◽  
pp. 191-202 ◽  
Author(s):  
J. JUNK ◽  
M. EICKERMANN ◽  
K. GÖRGEN ◽  
M. BEYER ◽  
L. HOFFMANN
Keyword(s):  
Climate Change ◽  
Oilseed Rape ◽  
Stem Elongation ◽  
Regional Climate ◽  
Regional Climate Change ◽  
Future Climate ◽  
Brassica Napus L ◽  
Climate Conditions ◽  
Ceutorhynchus Pallidactylus ◽  
The Impact

SUMMARYThe impact of projected regional climate change on the migration of cabbage stem weevil (Ceutorhynchus pallidactylus) to oilseed rape crops in the Grand Duchy of Luxembourg is evaluated for past and future time spans. Several threshold-based statistical models for the emergence and the main migration of C. pallidactylus were chosen from the literature and combined with selected regional climate change projections of the EU ENSEMBLES project. Additionally, a simple degree-day based model was used to assess the plant development under expected climate change conditions. An earlier onset as well as a prolongation of the possible emergence times and the main migration periods was detected. The onset of stem elongation of oilseed rape was predicted to occur 3·0 days earlier per decade, while emergence of C. pallidactylus was expected to occur between 3·0 and 3·3 days earlier per decade. The main migration period of the weevil to the field may start 2·0 days earlier per decade under future climate conditions. Additionally, the time span of possible migration is prolonged for about 30 days under projected future climate conditions.

scholarly journals Phenology of cabbage stem flea beetle (Psylliodes chrysocephala L.) in oilseed rape

2016 ◽  
Vol 31 (3-4) ◽  
pp. 139-144
Author(s):  
Lazar Sivcev ◽  
Draga Graora ◽  
Ivan Sivcev ◽  
Vladimir Tomic ◽  
Boris Dudic
Keyword(s):  
Oilseed Rape ◽  
Growth Stage ◽  
Flea Beetle ◽  
Winter Oilseed Rape ◽  
Trap Crop ◽  
Important Pest ◽  
Psylliodes Chrysocephala ◽  
New Generation ◽  
Conventional Field

The cabbage stem flea beetle (Psylliodes chrysocephala (L.) is an important pest of winter oilseed rape in Serbia. Beetles colonize oilseed rape in early October and are active in the field until first frost and wintertime. In autumn, adults can be seen laying eggs in the soil around plants. Larvae of P. chrysocephala developed intensively on leaf petioles in November, reaching their highest numbers at the end of the month. No infested plants were found in a conventional field, while 14.5% of all dissected leaf petioles were infested on an integrated field. On unprotected plants in an organic field, 76.0% of the plants were infested with larvae at the growth-stage BBCH 18-19, with 31.1% infested leaves on average. As a results, the number of plants was reduced by 51%, i.e. from 43.0/m2 recorded in the autumn to 22.0/m2 in the following spring. A new generation of P. chrysocephala beetles emerged from the soil in the first half of June and rapidly escaped the fields from almost dry plants. Our results showed that a part of the population stayed in aestivation and emerged in the following crop during the next season. On the following 5 March, 0.5 beetles/m2 were found in emergence cages in the organic field, while 0.81beetles/m2 were found in the former trap crop.

The life history, distribution and morphological updates of horned poppy feeder Acentrus histrio (Schoenherr, 1837) (Coleoptera: Curculionidae: Curculioninae)

2021 ◽  
Vol 29 (1) ◽  
Author(s):  
LEVENT GÜLTEKİN ◽  
MELEK GÜÇLÜ ◽  
NESLİHAN GÜLTEKİN ◽  
BORIS KOROTYAEV
Keyword(s):  
Life History ◽  
Host Plant ◽  
Host Plants ◽  
Early Spring ◽  
Female Genitalia ◽  
Morphological Description ◽  
Weevil Species ◽  
Young Leaves ◽  
New Generation ◽  
First Time

The augmented morphological description of the weevil species Acentrus histrio (Schoenherr, 1837) is provided and supplied with photographs of the terminalia and genitalia of both sexes. Female genitalia are described for the first time. Glaucium grandiflorum Boiss. & A. Huett and Glaucium corniculatum (L.) Rudolph (Papaveraceae) are reported as the host plants in Turkey. The adults emerge from the soil in very early spring, locate the host plant, feed on young leaves and buds, mate on the host plant, and females deposit eggs inside the seed capsules. The larvae feed with seeds, mature larvae leave capsules entering soil to pupate, and adults of the new generation hibernate in the soil at the root base of the host plant. This species is univoltine and produced one generation annually in eastern Turkey. Acentrus histrio is newly recorded for Azerbaijan, and A. boroveci Košťál, 2014, for Tajikistan.

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