First Record of Pachnoda interrupta Olivier Outbreak on Sorghum, Pearl Millet and Sunflower in Sudan

Abstract

During the autumn season of 2011, an outbreak of the sorghum
chafer Pachnoda interrupta Olivier (Coleoptera: Cetoniidae) occurred for
the first time in Sudan on four genotypes of sorghum (Sorghum bicolor),
four of pearl millet (Pennisetum glaucum) and eight of sunflower
(Helianthus annuus) in the Gezira Research Station Farm. The objective
of this study was to quantify the damage caused by the sorghum chafer to
these crops. The percentage of infested panicles (PIP), infested discs
(PID), panicle damage (PPD) and disc damage (PDD) and number of
beetles per panicle/disc were determined. Two sorghum genotypes
(Jumbo and Pannar) showed tolerance to the beetle, as they scored the
lowest PIP and PPD, whereas the other two (Kambal and Sugar graze)
were highly susceptible. All pearl millet genotypes showed high
susceptibility, scoring a range of 92.9-94.2 PIP and 98.2-98.8 PPD.
Alexandra sunflower genotype showed high tolerance, securing "zero"
PID and PDD; Pac 361, Pan 7033, Pan 7351 and Hysun 33 genotypes
showed tolerance; Sirena and ARC 310 had comparatively high disc
attraction and grains sensitivity, and Pac 317 showed the highest disc
attraction and seed sensitivity to the beetle. The study concluded that P.
interrupta has become a new potential serious pest of sorghum, pearl
millet and sunflower in Sudan. Infestation is variety/hybrid dependent
with sorghum and sunflower hybrids, and all tested pearl millet genotypes
were highly sensitive to the beetle.