Within plant distribution of Anthonomus grandis (Coleoptera: Curculionidae) feeding and oviposition damages in cotton cultivars

Abstract

The feeding and oviposition behavior of boll weevil in new cotton cultivars is essential for an adequate management. The objective of this study was to evaluate the vertical distribution of squares punctured for feeding and oviposition of the pest in the cultivars NuOPAL, DeltaOPAL, FMT-701, FMX-910 and FMX-993, and record the most and least preferred times of feeding and oviposition. The number of squares used for boll weevil feeding and oviposition were evaluated weekly in three parts of plant canopy. It was observed that, regardless the cultivar, A. grandis preferred to lay eggs in squares located in the upper part and feed on squares in the middle and upper parts. The boll weevil preferred to feed on cultivar FMT-701 in the beginning of the period of cotton flowering and fruiting, and the cultivars NuOPAL, DeltaOPAL, FMX-910 and FMX-993 throughout the whole period of flowering and fruiting. A. grandis preferred to lay eggs on cultivars NuOPAL, FMT-701 and FMX-993 at the beginning and end of flowering and fruiting of plants, while the cultivars DeltaOPAL and FMX-910 are used for oviposition throughout the period of flowering and fruiting.

Plant genotype and the preference and performance of herbivores: cultivar affects apple resistance to the florivorous weevil Anthonomus pomorum

“…Florivorous weevils in the genus Anthonomus , including the boll weevil Anthonomus grandis Boh. (Grigolli et al ., ), the pepper weevil Anthonomus eugenii Cano (Speranza et al ., ) and the strawberry blossom weevil Anthonomus rubi Herbst (Innocenzi et al ., ), pose serious threats to their crop host plants. Strong damage by Anthonomus weevils may also occur in wild host plants (Torezan‐Silingardi, ; Alves‐Silva et al ., ).…”

Feeding location affects demographic performance of cabbage aphids on winter canola

“…Feeding location has been reported to influence both fitness as well as natural‐enemy recruitment for herbivorous arthropods in other cultivated plant systems including chili (Idris & Roff, ), cotton (Griogolli et al., ), alfalfa (Berberet et al., ), tobacco (Athanassiou et al., ; Kavallieratos et al., ), sunflowers (Pekar, ), and other brassica crops, including Brassica nigra (L.) W.D.J. Koch (Smallegange et al., ).…”

Spatial and temporal distribution of cotton squares and small cotton bolls fallen on ground after damage by boll weevil and the efficiency of the equipment used to collect them

“…Results indicated that the measured distance was not affected by phenological development of the cotton plant, probably because of the phenotypic characteristics of the canopy of the cotton cultivar BRS 8H, which features cotton squares and positions of the flowering and fruiting, concentrated mostly around the main stem. Studies conducted with the cotton cultivars NuOpal, DeltaOpal FMT-701, FMX-910, and FMX-993 have revealed that the production and size of the fruit and its agronomic characteristics greatly depend on the location of the plant and the positions of the fruiting body both in the regions of vertical flowering and the regions of horizontal flowering, with more than 80% of the production defined at the regions of the bottom and middle-third of the cotton plant and at the first and second position of fruits (GRIGOLLI et al, 2013).…”

“…Greater numbers of cotton squares on the soil surface strips near the plant's lap corresponds to the first, second, and third position of the fruitful or sympodial branch until the sixth node of main axis, where most of these reproductive structures are located (GRIGOLLI et al, 2013). Therefore, if we considered one distance of the soil surface from the planting row until 0.22m, the percent of reproductive structures fallen on the soil with punctures of feeding and/or oviposition by boll weevil was 85.20%, which corresponded to the percent projection of cotton canopy of the cultivar BRS 8H.…”