Assessment of density-dependent feeding damage by the cotton dusky bug, Oxycarenus laetus Kirby (Hemiptera: Lygaeidae), in cotton

Muhammad Ahsan KHAN; Muhammad Dildar GOGI; Muhammad Hamid BASHIR

doi:https://doi.org/10.3906/tar-1303-21

Makale detayları

Assessment of density-dependent feeding damage by the cotton dusky bug, Oxycarenus laetus Kirby (Hemiptera: Lygaeidae), in cotton

Yazarlar:

Muhammad Ahsan KHAN | Muhammad Dildar GOGI | Muhammad Hamid BASHIR

Yayıncı:

TUBITAK

Ana Başlıklar:

Tarım

Dergi:

Turkish Journal of Agriculture and Forestry 2014 Vol.38 Issue 2, pp.198-206

Belge Tipi:

Makale

Yayın Tarihi:

5/2014

Belge Dili:

İngilizce

Document ID (Org No.):

2000807425

Sıklık:

İki Aylık

eISSN:

1303-6173

pISSN:

1300-011X

DOI:

https://doi.org/10.3906/tar-1303-21

Anahtar kelimeler:

Özet:

 

The dusky cotton bug, Oxycarenus laetus Kirby (Hemiptera: Lygaeidae), is a serious threat to cotton due to early cultivation of Bt cotton. These studies were carried out under laboratory and field conditions to estimate the feeding damage caused by O. laetus to seed weight, seed germination, and lint quality of cotton cultivar Bt-121 at 6 bug densities (0, 5, 10, 15, 20, and 25 adult pairs). The results revealed that seed germination and seed weight decreased, whereas percent reduction in seed germination and seed weight over control increased with increasing bug density. Bug density in the range of 5-25 pairs caused approximately 9.3%-40.7% reduction in seed germination and 7.5%-29.5% reduction in 100-seed weight over control in both laboratory and field trails. The color of lint changed from pure-white to white when bolls were exposed to 10 and 15 pairs of bugs, while it changed to light-yellow and slightly yellow when bolls were exposed to 20 and 25 pairs of bugs, respectively. Bug density had a high negative correlation with percent seed germination and 100-seed weight, while it had a high positive correlation with reduction in seed germination, reduction in 100-seed weight, and lint quality, under both laboratory and field conditions. Bug density explained more than 95% of total variability in seed germination, reduction in seed germination, 100-seed weight, and reduction in 100-seed weight under both laboratory and field conditions; it explained less than 95% (93.2%) of total variability in lint staining under field conditions. These results indicate that reductions in seed weight, seed germination, and lint quality depend upon bug density. Hence, appropriate control measures should be adopted to check consistent increases in the dusky cotton bug population to avoid seed germination and lint quality losses.

 

The dusky cotton bug, Oxycarenus laetus Kirby (Hemiptera: Lygaeidae), is a serious threat to cotton due to early cultivation of Bt cotton. These studies were carried out under laboratory and field conditions to estimate the feeding damage caused by O. laetus to seed weight, seed germination, and lint quality of cotton cultivar Bt-121 at 6 bug densities (0, 5, 10, 15, 20, and 25 adult pairs). The results revealed that seed germination and seed weight decreased, whereas percent reduction in seed germination and seed weight over control increased with increasing bug density. Bug density in the range of 5-25 pairs caused approximately 9.3%-40.7% reduction in seed germination and 7.5%-29.5% reduction in 100-seed weight over control in both laboratory and field trails. The color of lint changed from pure-white to white when bolls were exposed to 10 and 15 pairs of bugs, while it changed to light-yellow and slightly yellow when bolls were exposed to 20 and 25 pairs of bugs, respectively. Bug density had a high negative correlation with percent seed germination and 100-seed weight, while it had a high positive correlation with reduction in seed germination, reduction in 100-seed weight, and lint quality, under both laboratory and field conditions. Bug density explained more than 95% of total variability in seed germination, reduction in seed germination, 100-seed weight, and reduction in 100-seed weight under both laboratory and field conditions; it explained less than 95% (93.2%) of total variability in lint staining under field conditions. These results indicate that reductions in seed weight, seed germination, and lint quality depend upon bug density. Hence, appropriate control measures should be adopted to check consistent increases in the dusky cotton bug population to avoid seed germination and lint quality losses.

Makale detayları

Assessment of density-dependent feeding damage by the cotton dusky bug, Oxycarenus laetus Kirby (Hemiptera: Lygaeidae), in cotton

Yazarlar:

Muhammad Ahsan KHAN | Muhammad Dildar GOGI | Muhammad Hamid BASHIR

Yayıncı:

TUBITAK

Ana Başlıklar:

Tarım

Dergi:

Turkish Journal of Agriculture and Forestry 2014 Vol.38 Issue 2, pp.198-206

Belge Tipi:

Makale

Yayın Tarihi:

5/2014

Belge Dili:

İngilizce

Document ID (Org No.):

2000807425

Sıklık:

İki Aylık

eISSN:

1303-6173

pISSN:

1300-011X

DOI:

https://doi.org/10.3906/tar-1303-21

Key words: Dusky cotton bug

population densities

lint quality

seed germination

cotton

Sayı

Makale detayları

Assessment of density-dependent feeding damage by the cotton dusky bug, Oxycarenus laetus Kirby (Hemiptera: Lygaeidae), in cotton

Yazarlar: Muhammad Ahsan KHAN | Muhammad Dildar GOGI | Muhammad Hamid BASHIR

Yayıncı: TUBITAK

Ana Başlıklar: Tarım

Dergi: Turkish Journal of Agriculture and Forestry 2014 Vol.38 Issue 2, pp.198-206

Belge Tipi: Makale

Yayın Tarihi: 5/2014

Belge Dili: İngilizce

Document ID (Org No.): 2000807425

Sıklık: İki Aylık

eISSN: 1303-6173

pISSN: 1300-011X

DOI: https://doi.org/10.3906/tar-1303-21

Key words: Dusky cotton bug

population densities

lint quality

seed germination

cotton

Sayı

Yazarlar:

Muhammad Ahsan KHAN | Muhammad Dildar GOGI | Muhammad Hamid BASHIR

Yayıncı:

TUBITAK

Ana Başlıklar:

Tarım

Dergi:

Turkish Journal of Agriculture and Forestry 2014 Vol.38 Issue 2, pp.198-206

Belge Tipi:

Makale

Yayın Tarihi:

5/2014

Belge Dili:

İngilizce

Document ID (Org No.):

2000807425

Sıklık:

İki Aylık

eISSN:

1303-6173

pISSN:

1300-011X

DOI:

https://doi.org/10.3906/tar-1303-21