Heliothis spp. (Lepidoptera: Noctuidae) Damage and Yield Loss Estimated from Commercial Cotton Fields

Liapis, Peter S.; Moffitt, L. Joe; King, E. G.

doi:10.1093/jee/77.3.798

Cited by 2 publications

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“…For example, spraying on a damage threshold of 10% elicited a mean of four sprays, which gave a higher yield than cotton under a preventive regime of six sprays, indicating that some level of damage to cotton may actually stimulate it to a greater yield. Similar observations have previously been noted by Kincade et al (1970), McKinlay & Geering (1957 and Liapis et al (1984). Such compensatory behaviour was further illustrated by the fact that seed cotton yield from the unsprayed treatment was only 41-6% less than that from the standard regime.…”

Section: Resultssupporting

confidence: 85%

“…Most sprays timed on the basis of damage thresholds were carried out during the first four weeks of flowering (Table I). This fits in well with the feeding behaviour of Heliothinae spp., which tend to prefer flower buds to bolls (Liapis et al, 1984). Also, early weeks of flowering tend to coincide with influxes of H. armigera from alternative hosts flowering prior to cotton (Bebbington & Disney, 1953;Kabissa, 1981) and from diapausing pupae (Valentine, 1956).…”

Section: Resultsmentioning

confidence: 99%

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Evaluation of damage thresholds for insecticidal control of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) on cotton in eastern Tanzania

Kabissa

1989

Bull. Entomol. Res.

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The value of damage thresholds in determining the need for insecticide sprays against Helicoverpa armigera (Hübner) on cotton was evaluated in 1984 and 1985 in eastern Tanzania. Spraying at thresholds of 10, 20, 40 and 80% damaged squares was compared against spraying on a recommended prophylactic regime of six fixed-interval sprays. In both years, spraying on damage thresholds reduced the number of insecticide applications from six to between one and five without significantly affecting control of H. armigera, seed cotton yield or overall levels of damage to cotton.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Evaluation of damage thresholds for insecticidal control of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) on cotton in eastern Tanzania

Kabissa

1989

Bull. Entomol. Res.

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Yield Loss and Economic Threshold Level of Soybean due to Leaf Roller (<i>Apoderus cyaneus</i> Hope) in Nepal

Gyawali

1970

Nepal Agric. Res. J.

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Yield loss in soybean due to leaf roller (Apoderus cyaneus Hope) was studied at Khumaltar during 1985 and 1986 seasons. Field experiments were conducted during vegetative as well as reproductive stages of soybean. Rolled leaves of soybean with eggs, grubs and pupae were collected from the field and reared in the laboratory for adults. Adults were introduced into nylon cages installed at the central rows of each plot just after germination of soybean. Insects were maintained at population density of 25, 50 and 100 per m 2 . At maximum (100) adult density, the potential grain yield loss of cultivar, Ransom soybean in its vegetative and reproductive stages were 103 and 48 mg per day respectively from each adult of A. cyaneus. Percentages of yield losses were 36.2, 45.2, and 58.0 during vegetative and 37.5, 48.5 and 66.0 during reproductive stages from the insect population of 25, 50 and 100, respectively which, was not in accordance with the level of two and four fold increased population density of insect. Yield reduction was higher (260 and 108 mg per day) from each adult beetle at lower population level (25) in both vegetative and reproductive stages of soybean.

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Heliothis spp. (Lepidoptera: Noctuidae) Damage and Yield Loss Estimated from Commercial Cotton Fields

Cited by 2 publications

References 0 publications

Evaluation of damage thresholds for insecticidal control of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) on cotton in eastern Tanzania

Evaluation of damage thresholds for insecticidal control of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) on cotton in eastern Tanzania

Yield Loss and Economic Threshold Level of Soybean due to Leaf Roller (<i>Apoderus cyaneus</i> Hope) in Nepal

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