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This article in CS

  1. Vol. 20 No. 1, p. 59-63
    Received: Nov 6, 1978

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Effect of Planting Dates and Soybean Cultivars on Pod Damage by Corn Earworm1

  1. J. M. Joshi



Eight soybean [Glycine max (L.) Merr.] cultivars during 1974 and 16 cultivars during 1975 and 1976 were planted on five different planting dates with 14-day intervals between each planting to determine which soybean cultivars may escape corn earworm (Heliothis zea Boddie) damage. Soybeans planted by or after told-June generally were more susceptible to corn earworm than the earlier plantings. Each successive delay in planting resulted in more pod damage.

The cultivar ‘Delmar’ was highly susceptible, whereas ‘Wye’ exhibited minimum pod damage. The corn earworm showed a high level of non-preference towards Wye. Corn earworm infestations increased with each successive delay in planting. Maximum infestation was observed on soybeans planted in July. Strain ED 73.371 had the highest amount of active infestation, yet pod damage was very low. This indicates some other mechanism of resistance, such as antibiosis. Proper choice of soybean cultivar according to the desired planting date can help in minimizing pod damage from corn earworm.

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