Study

A study of the pest status and control of maize stem borers on the Niassa Plateau, Mozambique

  • Published source details Davies G. (1998) A study of the pest status and control of maize stem borers on the Niassa Plateau, Mozambique. International Journal of Pest Management, 44, 225-234

Actions

This study is summarised as evidence for the following.

Action Category

Alter the timing of insecticide use

Action Link
Natural Pest Control
  1. Alter the timing of insecticide use

    A randomised, replicated, controlled study in 1993-1994 in northern Mozambique (Davies 1998) found similar numbers of stem borers (Noctuidae) in plots of maize Zea mays treated with insecticide at 0-40, 40-80 and 80-120 days after planting, and between 120 days and harvest (1.1, 0.1, 0.5 and 1.0 borers/plant, respectively). Plots treated at 0-40 days after planting had more stem borers than controls treated throughout the growing season (0.03 borers/plant), but plots treated at other times had similar pest numbers to continuously treated controls. There was no difference in the percentage of stems infested (15-39%) or plants lost (42-48%) to stem borers for any of the treatments and controls. Yield was greater in plots treated after 40-80 days (4.8 t/ha) than in plots treated at other specific times (2.5-3.9 t/ha), but was similar to continuously treated controls (4.5 t/ha). Plots treated after 0-40 days (2.5 t/ha) and between 120 days and harvest (2.6 t/ha) had lower yields than continuously treated controls. Cyhalothrin insecticide was applied weekly in each time period. Each treatment was replicated four times in plots of four maize rows, 5 m long. Stem borer larvae and pupae were counted on 10 plants/plot at 120 days after planting.

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