Comparative Susceptibility of European Corn Borer, Southwestern Corn Borer, and Sugarcane Borer (Lepidoptera: Crambidae) to Cry1Ab Protein in a Commercial Bacillus thuringiensis Corn Hybrid

2006 ◽  
Vol 99 (1) ◽  
pp. 194-202 ◽  
Author(s):  
Fangneng Huang ◽  
B. Rogers Leonard ◽  
Rhett H. Gable
Keyword(s):  
Bacillus Thuringiensis ◽  
European Corn Borer ◽  
Cry1ab Protein ◽  
Corn Borer ◽  
Sugarcane Borer ◽  
Comparative Susceptibility ◽  
Southwestern Corn Borer ◽  
Corn Hybrid

scholarly journals The impact of Bacillus thuringiensis technology on the occurrence of fumonisins and other mycotoxins in maize

2016 ◽  
Vol 9 (3) ◽  
pp. 475-486 ◽  
Author(s):  
J. Díaz-Gómez ◽  
S. Marín ◽  
T. Capell ◽  
V. Sanchis ◽  
A.J. Ramos
Keyword(s):  
Bacillus Thuringiensis ◽  
Fungal Infection ◽  
European Corn Borer ◽  
Insect Pests ◽  
Animal Feed ◽  
Bt Maize ◽  
Cry1ab Protein ◽  
Corn Borer ◽  
Maize Hybrids ◽  
The Impact

In many developing countries, maize is both a staple food crop and a widely-used animal feed. However, adventitious colonisation or damage caused by insect pests allows fungi to penetrate the vegetative parts of the plant and the kernels, the latter resulting in mycotoxin contamination. Maize seeds contaminated with fumonisins and other mycotoxins pose a serious threat to both humans and livestock. However, numerous studies have reported a significant reduction in pest damage, disease symptoms and fumonisin levels in maize hybrids expressing the Bacillus thuringiensis (Bt) gene cry1Ab, particularly in areas where the European corn borer is prevalent. When other pests are also present, the cry1Ab gene alone offers insufficient protection, and combinations of insecticidal genes are required to reduce damage to plants caused by insects. The combination of Cry1Ab protein with other Cry proteins (such as Cry1F) or Vip proteins has reduced the incidence of pests and, indirectly, mycotoxin levels. Maize hybrids expressing multiple Bt genes, such as SmartStax®, are less susceptible to damage by insects, but mycotoxin levels are not routinely and consistently compared in these crops. Bt maize has a greater economic impact on Fusarium toxins than aflatoxins. The main factors that determine the effectiveness of Bt hybrids are the type of pest and the environmental conditions, but the different fungal infection pathways must also be considered. An alternative strategy to reduce mycotoxin levels in crops is the development of transgenic plants expressing genes that protect against fungal infection or reduce mycotoxin levels by in situ detoxification. In this review article, we summarise what is known about the relationship between the cultivation of Bt maize hybrids and contamination levels with different types of mycotoxins.

F2 screen for resistance to a Bacillus thuringiensis-maize hybrid in the sugarcane borer (Lepidoptera: Crambidae)

2007 ◽  
Vol 97 (5) ◽  
pp. 437-444 ◽  
Author(s):  
F.N. Huang ◽  
B.R. Leonard ◽  
D.A. Andow
Keyword(s):  
Bacillus Thuringiensis ◽  
European Corn Borer ◽  
Screening Method ◽  
Corn Stalk ◽  
Bt Maize ◽  
Corn Borer ◽  
Maize Leaf ◽  
Sugarcane Borer ◽  
Bt Resistance ◽  
Leaf Tissues

AbstractA novel F2 screening technique was developed for detecting resistance in sugarcane borer, Diatraea saccharalis (F.), to transgenic Bacillus thuringiensis (Bt)-maize expressing the Cry1Ab insecticidal protein. The F2 screening method involved (i) collecting larvae from maize fields; (ii) establishing two-parent families; (iii) screening F2 neonates for survival on Bt-maize leaf tissues; and (iv) confirming resistance on commercial Bt-maize plants. With the F2 screening method, 213 iso-line families of D. saccharalis were established from field collections in northeast Louisiana, USA and were screened for Bt resistance. One family was confirmed to carry a major Bt resistance allele(s). In a laboratory bioassay, larval mortality of the Bt-resistant D. saccharalis on Bt-maize leaf tissues was significantly lower than that of a Bt-susceptible strain. This Bt-resistant D. saccharalis population is the first corn stalk borer species that has completed larval development on commercial Bt-maize. The F2 screening protocol developed in this study could be modified for detecting Bt resistance alleles in other similar corn stalk borers, such as the European corn borer, Ostrinia nubilalis (Hübner), and the southwestern corn borer, D. grandiosella Dyar.

scholarly journals Weekly Applications of Bacillus Thuringiensis for European Corn Borer Control on Peppers, 1993

1995 ◽  
Vol 20 (1) ◽  
pp. 101-101
Author(s):  
J. Boucher ◽  
R. Adams ◽  
G. Nixon ◽  
J. Clark
Keyword(s):  
Bacillus Thuringiensis ◽  
European Corn Borer ◽  
Corn Borer
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