Experimental assessment of the impact of defoliation by Spodoptera littoralis on the growth and yield of Giza '75 cotton

Russell, Derek; Radwan, S. M.; Irving, N. S.; Jones, Keith A.; Downham, M.C.A.

doi:10.1016/0261-2194(93)90051-j

Cited by 29 publications

(28 citation statements)

References 4 publications

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“…Those lines were also highly resistant against the Heliothis larvae and showed minimum boll damage. Correlation between rates of photosynthesis for maximum boll formation was also reported (Russell et al 1993). A range of boll maturities confer tolerance to cotton insect pests.…”

Section: Morphological Studiesmentioning

confidence: 85%

Field evaluation and fiber analysis of transgenic cotton

Rashid

Khan

Husnain

et al. 2009

J. Crop Sci. Biotechnol.

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We report the field evaluation of second generation of transgenic cotton expressing Bacillus thuringiensis (Bt) genes cry1Ac and cry2A under CaMV 35S promoter. Sixty-five transgenic lines were grown under RCBD design. Transgenic plants exhibited inherent ability to resist target insect (p < 0.05 and 0.01). Morphological studies showed significant reduction in plant height making them favorable for breeding. Yield was significantly increased for the transgenic lines. Fiber analysis showed improved gin turn out 40% for transgenic lines in comparison to 32% for non-transformed lines. Fibre quality of transgenic lines was not affected when compared with non transgenic lines. Inheritance pattern for transgenic lines suggests the need of further studies to understand the complex molecular mechanisms for resistance management and biosafety studies to develop new Bt cotton varieties.

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Section: Morphological Studiesmentioning

confidence: 85%

Field evaluation and fiber analysis of transgenic cotton

Rashid

Khan

Husnain

et al. 2009

J. Crop Sci. Biotechnol.

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“…In previous studies, Kerby et al (1988) showed that cotton can withstand up to 57% defoliation (artificial removal of leaves) before first square without significant reduction in lint yield. Additionally, Russell et al (1993) conducted simulated defoliation studies in which cotton was repeatedly deJune, 1999 foliated (20%) over a period of 7 consecutive weeks, from early squaring to mid-bloom, with no effect on yield. However, Russell et al (1993) suggested that severe defoliation (>20%) during boll maturation could significantly impact yield by reducing the production of photosynthates in leaves necessary for maximum boll development.…”

Section: Discussionmentioning

confidence: 99%

“…Alternatively, defoliation at this late stage of plant maturity (NAWF < 5 plus 300 heat units) may not have affected yield because there was sufficient leaf area remaining to mature bolls. Cotton plants appear relatively unaffected by moderate (<40%) defoliation from early season to mid-flowering (Kerby et al 1988, Russell et al 1993). After plants have reached 5 NAWF and have accumulated heat units in excess of 300, late season defoliation low in the canopy also has little effect on yields (Torrey et al 1997).…”

Section: *O Egg Mass CL 1 Egg Mass E 3 Egg Masses Le] 6 Eggmentioning

confidence: 98%

Late Season Beet Armyworm (Lepidoptera: Noctuidae) Infestations on Cotton: Defoliation, Fruit Damage, and Yield Loss

Mascarenhas¹,

Cook²,

Leonard³

et al. 1999

The Florida Entomologist

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“…In consequence, the weekly per‐head defoliation obtained in our study corresponds only to a few percent of the total leaf surface of a cotton plant at flowering. As demonstrated by artificial defoliation experiments, cotton plants may tolerate a 20–25% weekly loss of assimilatory surface without any impact on yield (B ISHOP et al., 1978; R USSELL et al., 1993). Thus, it is unlikely that a rise of the currently applied threshold for S. littoralis would present an economic risk for Malagasy cotton growers.…”

Section: Discussionmentioning

confidence: 99%

Cotton pests and their natural enemies in Madagascar

Kuklinski

Borgemeister²

2002

J Applied Entomology

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An update on the cotton pest complex and its associated natural enemies in Madagascar is provided. Since the end of the 1970s, when the previous reports had been published, the population dynamics of the principal pests in Malagasy cotton have undergone considerable changes. The American bollworm Helicoverpa armigera Hübner (Lep., Noctuidae) is still a limiting factor for production and can be considered the key pest, whereas the Egyptian leaf worm Spodoptera littoralis Boisduval (Lep., Noctuidae) and the cotton aphid Aphis gossypii Glover (Hom., Aphididae) have become significant pests as a result of indiscriminate use of synthetic pyrethroids in the 1980s. New records of beneficials, in particular the discovery of the aphidopathogenic fungus Neozygites fresenii (Nowakowski) (Entomophthorales) in cotton aphid populations, are reported. Strategies to preserve predator populations in view of reducing disruptive insecticide treatments are discussed.

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Experimental assessment of the impact of defoliation by Spodoptera littoralis on the growth and yield of Giza '75 cotton

Cited by 29 publications

References 4 publications

Field evaluation and fiber analysis of transgenic cotton

Field evaluation and fiber analysis of transgenic cotton

Late Season Beet Armyworm (Lepidoptera: Noctuidae) Infestations on Cotton: Defoliation, Fruit Damage, and Yield Loss

Cotton pests and their natural enemies in Madagascar

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