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Impact of cultivation systems on Dichelops melacanthus (Dallas) (Heteroptera: Pentatomidae) population and damage and its chemical control on wheat

Chocorosqui, V.R., Panizzi, A.R.
Neotropical entomology 2004 v.33 no.4 pp. 487-492
Dichelops melacanthus, Pentatomidae, Heteroptera, insect pests, plant pests, adult insects, nymphs, insect control, chemical control, integrated pest management, Triticum aestivum, wheat, host plants, seed productivity, plant damage, crop yield, plant development, developmental stages, Glycine max, soybeans, Zea mays, corn, cropping systems, no-tillage, conventional tillage, crop rotation, field experimentation, Brazil
Results of field evaluations indicated that the neotropical pentatomid Dichelops melacanthus (Dallas) is associated with wheat, Triticum aestivum L. In the no-tillage cultivation system, adults and nymphs were mostly found on the soil, near the plant stems and underneath crop residues of the preceding summer crop, usually soybean, Glycine max (L.) Merrill, or corn, Zea mays L. Wheat grown under the conventional cultivation system showed minimal bug attack. D. melacanthus caused substantial damage to no-tillage wheat plants, particularly to seedlings. Bug attack reduces the number of seed heads of up to 34%. Seed yield was reduced in 31% due to the bugs' feeding, compared to plants free of damage. All developmental phases of the wheat plant were susceptible to the attack of D. melacanthus, and the greatest yield reduction occurred from stem elongation (26.5%) to milky grain stage (33.1%). Seed treatment using insecticides was efficient, greatly reducing the grain production losses.