Population Dynamics of Insect Pests and their Associated Predators at Different Plantations of Sugar Beet | ||
| Journal of Plant Protection and Pathology | ||
| Article 8, Volume 8, Issue 12, December 2017, Pages 651-656 PDF (189.89 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jppp.2017.46952 | ||
| Author | ||
| Amany A. Khalifa* | ||
| Biological Control Research Department, Plant Protection Research Institute, Agricultural Research Center, Egypt | ||
| Abstract | ||
| Sugar beet, Beta vulgaris L. has been introduced into Egypt by late1970s to share sugar cane in satisfying reqiurements of sugar consumers. This crop is liable to infestations by several insect pests. The current study was carried out at sugar beet fields at Sidi Salem District, Kafr El-Sheikh Governorate during 2015/16 and 2016/17 seasons to monitor population dynamics of the most abundant insects, predators and parasitoids at sugar beet fields. Kawemira cultivar was sown in three plantations; early (August plantation), medium (September plantation) and late (October plantation). Cassida vittata, Vill. was recorded in few numbers in the early and medium plantations, but was relatively more occurring in the late one (12.55 – 16.31 adults/25 sugar beet plants), particularly during April and May. Pegomyia mixta Vill. took almost tha same trend, but it was more detected during February, March and April. Aphis spp. were found with moderate numbers in 2016/17 season (17.58 – 28.30 nymphs and adults/25 plants), but were more occurring in October and November on sugar beet plants of August and September plantations. Empoasca lybica (De Berg) nymphs and adults were recorded in considerable numbers during spring. Ostrinia nubilalis (Hubner) larvae were obtained in very low numbers, but its population density was relatively higher in December in sugar beet plots of the early plantation. Spodoptera littoralis (Boisd) larvae displayed moderate population density (5.48 –7.74) in the first plantation, particularly in September and October, but its numbers were very low throughout remaining examinations. Scrobipalpa ocellatella (Boyd) larvae were found in high numbers in sugar beet plants of October plantation (37.12 – 38.69 per 25 sugar beet plants). The predatory coccinellids were more detected in the first plantation (6.24 – 16.13) than in the second (3.44 – 7.08) and the third plantation (2.00 – 3.21 adults/25 sugar beet plants). Other than coccinellid predators, Rhizobius litura (Fabr.), Paederus alfierii Koch. and Orius sp., were surveyed. In addition, two parasitoids were surveyed; Pimpla roborator (Fab) and Bracon sp. | ||
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