scholarly journals WHORL-STAGE INSECTICIDE TREATMENTS FOR MANAGEMENT OF FIRST-GENERATION EUROPEAN CORN BORERS, 1998

1999 ◽  
Vol 24 (1) ◽  
Author(s):  
M. A. Boetel ◽  
B. W. Fuller
Keyword(s):  
First Generation ◽  
Corn Borers

scholarly journals Weather Conditions and Maturity Group Impacts on the Infestation of First Generation European Corn Borers in Maize Hybrids in Croatia

Plants ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1387
Author(s):  
Renata Bažok ◽  
Ivan Pejić ◽  
Maja Čačija ◽  
Helena Virić Gašparić ◽  
Darija Lemić ◽  
...  
Keyword(s):  
First Generation ◽  
Weather Conditions ◽  
Climatic Conditions ◽  
Key Factors ◽  
Maturity Group ◽  
Climatic Regions ◽  
Corn Borers ◽  
Relative Air Humidity ◽  
Observed Damage ◽  
Maturity Groups

Overwintering success and weather conditions are the key factors determining the abundance and intensity of the attack of the first generation of European corn borers (ECB). The tolerance of maize to the 1st generation of ECB infestation is often considered to be connected with the maize maturity time. The aims of this research were (I) to examine the reactions of different maize FAO maturity groups in term of the damage caused by ECB larvae, (II) to analyze the influence of four climatic regions of Croatia regarding the damage caused by ECB larvae, and (III) to correlate observed damage between FAO maturity groups and weather conditions. First ECB generation damage has been studied in the two-year field trial with 32 different hybrids divided into four FAO maturity groups (eight per group) located at four locations with different climatic conditions. The results showed a lack of correlation between the FAO maturity group and the percent of damage. The percent of damage was positively correlated with the average air temperature in June (r = 0.59 for 2017 and r = 0.74 in 2018, p = 0.0001) within the range from 20 to 24.5 °C and was negatively correlated with the relative air humidity (r = −0.58 in 2017 and r = −0.77 in 2018, p = 0.0001) within the range of 50% to 80%. Our results provide a better understanding of the different factors that influence ECB damage. The obtained data could be used to predict the damage from the first generation of ECB under the weather conditions of different regions.

Reduction of Corn Yield by First-Generation Southwestern Corn Borers

1958 ◽  
Vol 51 (6) ◽  
pp. 747-749 ◽  
Author(s):  
K. D. Arbuthnot ◽  
R. R. Walton ◽  
J. S. Brooks
Keyword(s):  
First Generation ◽  
Corn Yield ◽  
Corn Borers

Managing Colorado Potato Beetles (Coleoptera: Chrysomelidae) and European Corn Borers (Lepidoptera: Pyralidae) in Potato with Foliar Applications of Bacillus thuringiensis Berliner

2000 ◽  
Vol 35 (4) ◽  
pp. 373-384 ◽  
Author(s):  
Brian A. Nault ◽  
John Speese
Keyword(s):  
Bacillus Thuringiensis ◽  
Colorado Potato Beetle ◽  
European Corn Borer ◽  
First Generation ◽  
Solanum Tuberosum L ◽  
Potato Crop ◽  
Corn Borer ◽  
Corn Borers ◽  
Potato Beetle ◽  
Leptinotarsa Decemlineata Say

Application timing and rate combinations of Bacillus thuringiensis Berliner used for protecting Irish potato, Solanum tuberosum L., from defoliation by the Colorado potato beetle, Leptinotarsa decemlineata (Say), and stem injury by the European corn borer, Ostrinia nubilalis (Hübner), were investigated. Significant reductions in defoliation levels during bloom, populations of first-generation potato beetle adults, and the percentage of stems injured by corn borers at the end of the season in B. thuringiensis-treated potato were considered criteria for a successful management strategy. Although Colorado potato beetle infestations were managed effectively with B. thuringiensis, European corn borer populations were not reduced to a commercially acceptable level. In each of 3 yrs, neither an increase in the number of applications (from 1 to 4) nor an increase in rate (from 0.9 to 3.8 liters/ha) of B. thuringiensis subsp. kurstaki improved the level of corn borer control. In contrast, results indicated that 1 application of B. thuringiensis subsp. tenebrionis, timed when there was >1 large potato beetle larva per stem, using a 4.7 liters/ha rate protected the potato crop during the bloom stage. However, this strategy may not be sufficient to prevent significant levels of defoliation by first-generation potato beetle adults during post-bloom or reduce the size of this population, which will infest next season's crop. For this reason, the B. thuringiensis subsp. tenebrionis timing and rate regimen described above may be most effective in fields where the overwintering potato beetle population is predicted to be low to moderate (e.g., <1 adult per 5 stems), whereas two applications may be most effective in fields where densities are greater.

Sign in / Sign up

Export Citation Format

Share Document