NDLI: Effect of elevated atmospheric carbon dioxide on the use of foliar application of Bacillus thuringiensis

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Effect of elevated atmospheric carbon dioxide on the use of foliar application of Bacillus thuringiensis

Content Provider	Springer Nature Link
Author	Coviella, C.E. Trumble, J.T.
Copyright Year	2000
Abstract	Toxins from Bacillus thuringiensis have beenused as pest management tools for more than 50 years. The effect of these toxins depends on the quantityof Bacillus thuringiensis (Bt) toxins ingestedby susceptible insects. Food ingestion is affected byCO2 concentration; plants grown in elevatedCO2 often have increased carbon/nitrogen ratios(C/N), resulting in greater leaf area consumption. Therefore, we hypothesized that elevated CO2would improve the efficacy of foliar applications ofB. thuringiensis. Cotton plants were grown ateither ambient (360–380 μl/l) or elevated CO2(900 μl/l). Groups of plants in both CO2treatments were exposed to low (30 mg/kg soil/week) orhigh (130 mg/kg soil/week) nitrogen (N) fertilizationlevels in a split plot design. The resulting plantswere assessed for N and carbon (C) contents. Leafdisks from the same plants were dipped in a Btsolution and then fed to Spodoptera exigua(Hübner), an insect species of considerableeconomic importance. Elevated CO2 significantlyreduced total N, and increased the C/N. Nitrogenfertilization significantly affected consumption byearly stadia larvae, larval weight gain, and relativegrowth rate (RGR). Interactions between CO2concentration and N fertilization level significantlyimpacted late stadia larval food consumption, andthrough differential Bt toxin intake, affectedduration of larval stage and mortality to the adultstage. We conclude that the elevated atmosphericCO2 concentrations expected in the next centurywill interact with commercial fertilization practicesto enhance the efficacy of B. thuringiensisformulations applied topically to crops. Theimplications for improved control are discussed.
Starting Page	325
Ending Page	336
Page Count	12
File Format	PDF
ISSN	13866141
Journal	BioControl
Volume Number	45
Issue Number	3
e-ISSN	15738248
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2000-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Evolutionary Biology Plant Sciences Plant Pathology Animal Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Insect Science Agronomy and Crop Science

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