scholarly journals Natural parasitism of the second generation European corn borer eggs Ostrinia nubilalis (Hübner) (Lepidoptera, Pyralidae) by Trichogramma spp. in sweet corn fields in Vojvodina, Serbia – short communication

2017 ◽  
Vol 53 (No. 1) ◽  
pp. 50-54 ◽  
Author(s):  
Tancik Ján
Keyword(s):  
European Corn Borer ◽  
Sweet Corn ◽  
Egg Parasitoid ◽  
Trichogramma Evanescens ◽  
Corn Borer ◽  
North West ◽  
Egg Parasitism ◽  
Lepidoptera Pyralidae ◽  
Corn Fields ◽  
Natural Parasitism

Natural parasitism of the European corn borer eggs (Hübner) by Trichogramma spp. (Hymenoptera, Trichogrammatidae) was assessed in sweet corn field in north-west Serbia, region Vojvodina at the localities of Ruski Krstur, from 2004 till 2007. The rate of egg parasitism in 2004 varied from 35.89% to 73.58%. The parasitism in 2005 was lower than in 2004. On four different sampling dates in 2005 parasitism varied from 28.48% to 57.05% and averaged 39.4%. In 2006 parasitism fluctuated between 9.31 and 62.9%, averaging 32.15%. In 2007 parasitism varied from 36.8% to 54.54% and averaged 43.48%. The egg parasitoid species was identified as Trichogramma evanescens (Westwood). The study showed that this natural enemy occurred constantly in sweet corn fields but its number greatly fluctuated from year to year.

Natural Parasitism and Release Efficiency of Trichogramma evanescens Westwood in Ostrinia nubilalis Hübner Attacking Maize in Turkey

2009 ◽  
Vol 44 (2) ◽  
pp. 132-140 ◽  
Author(s):  
Sevcan Oztemiz
Keyword(s):  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
Grain Weight ◽  
Control Treatment ◽  
Trichogramma Evanescens ◽  
Insecticide Treatment ◽  
Corn Borer ◽  
Lepidoptera Pyralidae ◽  
1000 Grain Weight ◽  
Natural Parasitism

The natural parasitism rate and the release efficiency of the egg parasitoid, Trichogramma evanescens Westwood (Hymenoptera: Trichogrammatidae), in the biological control of the European corn borer, Ostrinia nubilalis Hübner (Lepidoptera: Pyralidae), was determined in field plots of maize in the Eastern Mediterranean, Turkey. Parasitoids were released in maize plots as parasitized eggs of laboratory-reared Ephestia kuehniella Zeller (Lepidoptera: Pyralidae). The parasitized eggs (n = 150,000) were released twice in a 10-d interval at the beginning of the oviposition period of the third generation of O. nubilalis in the second crop of maize in released treatment (without insecticides). Other treatments were an untreated control (without wasps and without insecticides) and an insecticide treatment (Lambda-Cyhalothrin, 50 g I−1 300 ml ha−1; without wasps). Ostrinia nubilalis egg masses, larvae and plant damage were regularly assessed until crop harvest. Parasitization of egg masses by T. evanescens was determined in each sample. The mean (± SD) percentage of parasitized O. nubilalis eggs was 86.2 ±l11.6 (± SD)%. Compared with the control treatment, the number of plants damaged by European corn borer larvae in the release treatment was reduced by 96%, whereas the number of larvae was reduced by 95.2%. Average grain yield was 8,800 ± 15.2 kg ha−1 (380.0 ± 1.6 g per 1000 grain weight) in the Trichogramma release treatment without insecticide, 7,000 ± 28.8 kg ha−1 (314.8 ± 2.9 g per 1000 grain weight) in the control treatment, and 8,533 ± 8.8 kg ha−1 (360.4 ± 8.5 g per 1000 grain weight) in the insecticide treatment. The grain yield and 1000 grain weight differences differed significantly (P ≤ 0.01) between the untreated control and the other two treatments (released treatment and insecticide treatment). Natural parasitization of O. nubilalis eggs by T. evanescens as observed in control and insecticide-treated plots was 30.2%. These results indicate that biological control of O. nubilalis with T. evanescens should be developed as an integral control method in integrated management programs for maize grown in Turkey.

DOSE–MORTALITY RESPONSE OF EUROPEAN CORN BORER (LEPIDOPTERA: PYRALIDAE) THIRD-INSTAR LARVAE TO SELECTED INSECTICIDES

1993 ◽  
Vol 125 (6) ◽  
pp. 1137-1139 ◽  
Author(s):  
William D. Hutchison
Keyword(s):  
United States ◽  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
Sweet Corn ◽  
Corn Borer ◽  
Mortality Response ◽  
Ca 50 ◽  
Lepidoptera Pyralidae ◽  
Economic Pest ◽  
Insecticide Control

The European corn borer, Ostrinia nubilalis Hübner, continues to be a consistent economic pest of field and sweet corn (Zea mays L.) in the upper midwestem United States. In Minnesota alone, O. nubilalis control costs and losses to sweet corn (ca. 50 630 ha) exceed $5,000,000 annually (Noetzel et al. 1985). Despite recent efforts to implement alternatives (Lewis and Bing 1991; Prokrym et al. 1992; Bartels and Hutchison 1993; Bolin et al. 1993), insecticide control continues to play a central role in O. nubilalis management programs.

Treatment Thresholds for European Corn Borer (Lepidoptera: Pyralidae) Infestations in Early-Season Fresh Market Sweet Corn

1998 ◽  
Vol 33 (4) ◽  
pp. 393-399 ◽  
Author(s):  
Dale I. M. Riggs ◽  
Michael P. Hoffmann ◽  
Larry C. Thetford
Keyword(s):  
New York ◽  
European Corn Borer ◽  
Sweet Corn ◽  
Fresh Market ◽  
Marketable Yield ◽  
Corn Borer ◽  
Air Blast ◽  
Early Season ◽  
Treatment Thresholds ◽  
Lepidoptera Pyralidae

We examined the effect of varying thresholds for treatment of first generation European corn borer, Ostrinia nubilalis (Hübner), infestations in early-season fresh market sweet corn in eastern New York over a 3-year period. Seven treatment thresholds were compared: (1) 15% infested plants at whorl stage, 5% infested plants at tassel and silk stage, (2) 15% at whorl stage, 15% at tassel and silk stage, (3) 30% at whorl stage, 5% at tassel and silk stage, (4) 30% at whorl stage, 15% at tassel and silk, (5) 5% at tassel and silk stage, (6) 15% at tassel and silk stage, and (7) control (untreated). When thresholds were reached, permethrin was applied using an air-blast sprayer. Results indicated little difference in percentage marketable ears whether plants were treated or not at whorl stage, and the tassel stage threshold could be raised to 15% infested plants with no significant effect on percentage marketable ears. We found no difference in marketable yield among plots treated from one side or both sides with an air-blast sprayer.

Effect of Bacillus thuringiensis Application Interval on European Corn Borer (Lepidoptera: Pyralidae) Control in Sweet Corn

1995 ◽  
Vol 30 (3) ◽  
pp. 374-389 ◽  
Author(s):  
David W. Bartels ◽  
William D. Hutchison ◽  
Vincent A. Fritz ◽  
George R. Klacan
Keyword(s):  
Bacillus Thuringiensis ◽  
European Corn Borer ◽  
Sweet Corn ◽  
Natural Populations ◽  
Corn Borer ◽  
First Instar ◽  
Additional Control ◽  
Dependent Variables ◽  
Lepidoptera Pyralidae ◽  
Low Rate

Ground-applied treatments of two commercial Bacillus thuringiensis subsp. kurstaki formulations (MVP and Dipel ES) and tank-mixes with a pyrethroid (Ambush 2E) were evaluated for control of European corn borer, Ostrinia nubilalis (Hübner), larvae in sweet corn. Treatments were applied at average intervals of 3.4, 5, 7, and 10 days to determine field persistence. Manual infestations of first-instar O. nubilalis were used to augment natural populations. During both years, there were no significant interactions between application interval and treatment for all dependent variables tested, including late instars per ear, percent marketability, yield, and predator density. Regardless of application interval, MVP provided greater larval control than Dipel ES. However, the decline in efficacy of the encapsulated MVP formulation occurred at the same rate as that of the non-encapsulated Dipel ES formulation over the 3.4 to 10-d intervals. Tank-mixes of B. thuringiensis + low-rate permethrin provided no additional control compared with low-rate permethrin alone. Given the infestation levels present in this test, neither B. thuringiensis formulation provided control sufficient to maintain current processor standards of 5–10% infested ears at harvest.

Distribution of European Corn Borer (Lepidoptera: Pyralidae) Egg Masses and Larvae on Sweet Corn in New York

1986 ◽  
Vol 15 (3) ◽  
pp. 501-506 ◽  
Author(s):  
A. M. Shelton ◽  
J. P. Nyrop ◽  
A. Seaman ◽  
R. E. Foster
Keyword(s):  
New York ◽  
European Corn Borer ◽  
Sweet Corn ◽  
Corn Borer ◽  
Egg Masses ◽  
Lepidoptera Pyralidae

Effect of Weed Abundance on European Corn Borer (Lepidoptera: Pyralidae) Infestation of Sweet Corn

1990 ◽  
Vol 19 (6) ◽  
pp. 1858-1865 ◽  
Author(s):  
Donald C. Weber ◽  
Francis X. Mangan ◽  
David N. Ferro ◽  
Herbert V. Marsh
Keyword(s):  
European Corn Borer ◽  
Sweet Corn ◽  
Corn Borer ◽  
Lepidoptera Pyralidae

scholarly journals A study on percentages of damage ratios of the European corn borer (ECB), Ostrinia nubilalis (Hübner) (Lepidoptera: Pyralidae) on sweet corn cultivars

2017 ◽  
Vol 4 (2) ◽  
pp. 1
Author(s):  
Nihat Demirel ◽  
Ömer Konuşkan
Keyword(s):  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
Sweet Corn ◽  
First Year ◽  
Corn Borer ◽  
Important Pest ◽  
Lepidoptera Pyralidae ◽  
Second Year

The European corn borer (ECB), Ostrinia nubilalis (Hübner) (Lepidoptera: Pyralidae) is one of the most important pest of grain corn and sweet corn in Turkey. The objective of this study was to assess percentage damage ratios of the ECB on stalk and corncobs of various sweet corn varieties in Reyhanlı district of Hatay province of Turkey.  The studies were carried out in 2015-2016 with four different sweet corn varieties including Caremelo, Vega, Merit and Batem. After two years of the study, the ECB larvae caused significant damages on stalk and corncobs of all sweet corn varieties.  The percentage damage of stalk and corncobs varied for each of the sweet corn varieties in both years.  In the first year, the highest percentages of stalk damage ratios were recorded on Batem (32.45), followed by Vega (19.85), Merit (17.07) and Caremelo (16.72).  In the second year,  the highest percentages of stalk damage ratios were observed on Merit (59.34),  followed by Caremelo (51.65),  Batem (45.09) and Vega (35.49).  In the first year, the largest percentages of corncobs damage ratios were recorded on Vega (25.73), followed by Batem (16.74), Caremelo (12.11), and Merit (9.30). In the second year,  the highest percentages of corncobs damage ratios were observed on Caremelo (14.31), followed by Merit (13.72), Batem (9.98) and Vega (8.93).  In conclusion, the largest percentages of stalk + corncobs damages ratios were observed on Batem (49.19), followed by Vega (45.58), Caremelo (28.83) and Merit (26.37) in 2015, while the highest percentages of stalk + corncobs damages ratios were recorded on Merit (73.06), followed by Caremelo (65.96), Batem (55.07) and Vega (44.42) in 2016.

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