scholarly journals Imaginal and ovicidal effect of some insecticides against Bruchus pisorum L. (Coleoptera: Chrisomelidae)

2015 ◽  
Vol 54 (1) ◽  
pp. 41-47 ◽  
Author(s):  
I. M. Nikolova
Keyword(s):  
Toxic Effect ◽  
Field Conditions ◽  
Forage Crops ◽  
Infected Seed ◽  
Highest Weight ◽  
Ovicidal Effect ◽  
Spray Timing ◽  
Bruchus Pisorum

Abstract Trials were conducted in 2011 and 2012 at the Institute of Forage Crops, Pleven, Bulgaria, in order to study the imaginal and possible ovicidal effect of some insecticides against Bruchus pisorum under field conditions. Treatments with insecticides were started after the appearance of the first pea weevils eggs on pods located on the bottom two nodes. It was found that treatment with acetamiprid; thiacloprid; thiacloprid+deltamethrin; 50 g cypermethrin+480 g chlorpyrifosethyl, 50 g cypermethrin+500 g chlorpyrifosethyl and zeta-cypermethrin resulted in the cessation of additional oviposition on the lower nodes by Bruchus pisorum, due to the toxic effect of the insecticides on the pea weevil. It was found that spraying with acetamiprid and zeta-cypermethrin was the most effective. These insecticides significantly reduced the proportion of infected pods in comparison with the proportion of pods with eggs before the treatment by 30.2 and 27.4% and by 15.8 and 24.0% in 2011 and 2012, respectively. The use of acetamiprid and zeta-cypermethrin was also associated with the lowest percentage of infected seeds (21.7 and 23.6%, respectively), with the lowest percentage of infected seed in infected pods (40.5 and 42.5%, respectively) and the highest weight of 1000 infected seeds (161.94 and 182.04 g, respectively). It was concluded that the management of pea weevils in the crop with acetamiprid and zetacypermethrin can lead to satisfactory results when spray timing is chosen when the first eggs are visible.

scholarly journals Ovicidal effects of thiacloprid, acetamiprid, lambda-cyhalothrin and alpha-cypermethrin on Bruchus pisorum L. (Coleoptera: Chrysomelidae) eggs

2011 ◽  
Vol 47 (No. 3) ◽  
pp. 109-114 ◽  
Author(s):  
M. Seidenglanz ◽  
J. Rotrekl ◽  
J. Poslušná ◽  
P. Kolařík
Keyword(s):  
Czech Republic ◽  
Field Conditions ◽  
Egg Survival ◽  
The Czech Republic ◽  
Real Effects ◽  
First Instar ◽  
Lambda Cyhalothrin ◽  
Ovicidal Effects ◽  
Bruchus Pisorum

The effects of two pyrethroid (lambda-cyhalothrin, alpha-cypermethrin) and two neonicotinoid (acetamiprid, thiacloprid) insecticides on B. pisorum L. eggs were compared under field conditions in the Czech Republic in 2005–2007. The main objective of the study was to find out what real effects can be expected from the available insecticides registered in Europe when applied at the time of the first egg occurrence on lower pods. In general, the rates of Bruchus pisorum egg (+ first instar larvae) survival were significantly lower with all the insecticides compared in the study, in each of the three years (2005, 2006, 2007). The tested insecticides showed some ovicidal effects and also some larvicidal effects. The tested pyrethroids (lambda-cyhalothrin, alpha-cypermethrin) showed somewhat higher effectiveness in comparison with the neonicotinoids (acetamiprid, thiacloprid). Alpha-cypermethrin was the most effective in all three years. In 2006 and in 2007 this insecticide significantly reduced the rates of egg survival in comparison with acetamiprid. In contrast, acetamiprid was the least effective insecticide in each of the three years.

scholarly journals Development of Plant-Parasitic Nematode Populations on Forage Crops under Field Conditions

2017 ◽  
Vol 16 (2) ◽  
pp. 51-62
Author(s):  
Mahfouz Abdel Gawad ◽  
Mohamed Eissa ◽  
Abd- Elmoneim El-Gindi ◽  
Grover Smart
Keyword(s):  
Parasitic Nematode ◽  
Plant Parasitic Nematode ◽  
Field Conditions ◽  
Forage Crops ◽  
Plant Parasitic

The effect of benomyl on Gloeotinia temulenta under laboratory and field conditions

1971 ◽  
Vol 11 (53) ◽  
pp. 693 ◽  
Author(s):  
DC McGee
Keyword(s):  
Lolium Perenne ◽  
No Reduction ◽  
Field Studies ◽  
Field Conditions ◽  
Seed Infection ◽  
Laboratory Studies ◽  
Causal Organism ◽  
Infected Seed ◽  
Application Rates ◽  
Seed Crops

Laboratory studies confirmed that benomyl can completely suppress apothecial formation of Gloeotinia temulenta, the causal organism of blind seed disease in grasses. Field studies in Lolium perenne seed crops showed that benomyl, applied at 2.80 and 5.60 kg/hectare, reduced the numbers of apothecia formed by 80 and 90 per cent respectively, while no reduction was apparent at 0.56 kg/hectare. Better results were obtained when the compound was applied in November, just before flowering, than when applied in September or October. At the application rates used, benomyl did not protect plants against seed infection. However, the degree of suppression of apothecial formation possible with benomyl suggests that, in areas where reinfestation of fields with infected seed after harvest is light, the compound should control blind seed disease by limiting formation of apothecia, which are the source of ascospore inoculum, to insignificant proportions.

Effect of seed coating on germination of Ciliate Medick [Medicago ciliaris (L.) All.] and Snail Medick [Medicago scutellata (L.) Mill.]

2019 ◽  
Author(s):  
B. KIR
Keyword(s):  
Seed Coat ◽  
Acid Treatment ◽  
Field Conditions ◽  
Seed Coating ◽  
Forage Crops ◽  
Seed Technology ◽  
Field Crops ◽  
Medicago Scutellata ◽  
Medicago Ciliaris ◽  
Sowing Seed

A study was conducted in the Seed Technology Laboratory of Department of Field Crops, Pasture and Forage Crops Section, Faculty of Agriculture of Ege University, Turkey. Aim of the study was to remove the seed coat hardness by various treatments of Ciliate and Snail Medick to enhance germination which is significant in terms of agronomical handicaps of sowing small seeded legumes under field conditions. Pre-sowing seed treatments (Control, scarification by sandpaper, acid treatment with 95.0-98.0% H2SO4 for 5-10-15 minutes and soaking in water for 24-48 hours) were practiced on these small seeded legumes. All observations and tests were conducted following ISTA regulations and notifications. Germination of tested seeds highly increased by acid treatment for 10-15 minutes duration, while scarification treatment provided favorable germination rates.

EXPERIMENTS ON THE CONTROL OF THE EUROPEAN SKIPPER, THYMELICUS LINEOLA (LEPIDOPTERA: HESPERIIDAE) BY AERIAL APPLICATION OF A NUCLEAR POLYHEDROSIS VIRUS

1976 ◽  
Vol 108 (11) ◽  
pp. 1221-1222 ◽  
Author(s):  
W. A. Smirnoff ◽  
J. N. McNeil ◽  
J. R. Valero
Keyword(s):  
Nuclear Polyhedrosis Virus ◽  
Insect Pest ◽  
Field Conditions ◽  
Aerial Application ◽  
Forage Crops ◽  
Polyhedrosis Virus ◽  
Nuclear Polyhedrosis ◽  
Natural Virus

A natural virus epizootic, caused by a nuclear polyhedrosis virus, was observed in several populations of the European skipper, Thymelicus lineola (Ochs .), at Normandin, Que., in 1974 (Smirnoff 1974). A substantial supply of this virus was collected and experiments were conducted under laboratory and field conditions to evaluate its pathogenicity against the skipper, its possible transmission from one generation to the next, and its potential as a means of control of T. lineola, a serious insect pest of forage crops in several regions of Quebec (McNeil et al. 1975).

scholarly journals The effect of soil pH on copper toxicity to forage maize grown under field conditions.

1980 ◽  
Vol 28 (3) ◽  
pp. 164-184 ◽  
Author(s):  
T.M. Lexmond
Keyword(s):  
Field Experiment ◽  
Toxic Effect ◽  
Mineral Composition ◽  
Crop Yield ◽  
Soil Ph ◽  
Copper Toxicity ◽  
Field Conditions ◽  
Forage Maize ◽  
Cu Toxicity ◽  
Ion Activity

Cu toxicity to forage maize was studied in a factorial field experiment comprising 4 Cu rates (0, 100, 200 or 300 kg Cu/ha) and 4 pH levels. Results are presented for crop yield and mineral composition. Raising the soil pH reduced the toxic effect of Cu to a smaller extent than would be predicted from the reduction in the Cu2+ ion activity. Apparently an increase in pH increased the toxicity of Cu2+ ions in sol. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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