Economic Injury Levels of Dysdercus volkeri F. (Heteroptera: Pyrrhocoridae) on Cotton in Samaru Zaria, Nigeria

Authors

  • N Musa
  • I Onu
  • L J Bamaiyi
  • R S Adamu

Keywords:

Cotton, Dysdercus volkeri, Economic Injury Levels

Abstract

Field trials were carried out during 2019 and 2020 cropping seasons at Samaru, Zaria to study the Economic Injury Levels (EIL) of Dysdercus volkeri on cotton. Nymphs instar at levels 0 (control), 5, 10, 15, 20 and 25 per meter row of cotton variety (SAMCOT- 9) were released at boll forming stage into caged cotton. The treatments were arranged in a Randomized Complete Block Design (RCBD) replicated four times. Parameters assessed included, number of bolls produced, damaged bolls, weight of damaged bolls and of undamaged bolls and the rate of association between nymph density and weight of lint. The result obtained showed decreased yield in cotton with increase in number of nymphs infested in the caged cotton. Infestation with 5 and 25 nymphs per caged plant during 2019 and 2020 cropping seasons caused decrease in yield of 16.215 kg ha-1 , 15.382 kg ha-1 and 16.04 kg ha-1 , 9.618 kg ha-1 respectively. EIL for D. volkeri nymphs were determined as 2.30 and 2.91 nymphs when cypermethrin insecticide was used in 2019 and 2020, respectively. Therefore, control measures should be applied when the D. volkeri nymph populations reaches at least two nymph per meter row length in cotton plant.

Author Biographies

N Musa

Department of Crop Protection,
Institute for Agricultural Research,
Ahmadu Bello University, Zaria

I Onu

Department of Crop Protection,
Institute for Agricultural Research,
Ahmadu Bello University, Zaria

L J Bamaiyi

Department of Crop Protection,
Institute for Agricultural Research,
Ahmadu Bello University, Zaria

R S Adamu

Department of Crop Protection,
Institute for Agricultural Research,
Ahmadu Bello University, Zaria

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Published

2022-05-09

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Section

Articles