Biology and ecology of the turnip aphid (Lipaphis Erysimi Kaltenbach) (Homoptera: Aphididae) on pechay (Brassica Chinensis Linnaeus).

Date

4-2012

Degree

Bachelor of Science in Agriculture

Major Course

Major in Entomology

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Sumalde, Augusto C.

Abstract

The life history of Lipaphis erysimi Kaltenbach (Homoptera:Aphididae) was studied on pechay (Brassica chinensis L.) under natural conditions from January to March, 2012. Individual aphids were isolated on clip-on cages on the leaves of potted pechay. Lipaphis erysimi undergoes four nymphal instars before reaching maturity with mean durations of: 0.83±0.33, 1.43±0.49, 1.32±0.47, 1.06±0.28 days, respectively, for the first, second, third and fourth instars. Pre-parturation period ranged from 0.5 to 2 days (0.49±0.41 days) after the aphids reached the adult stage. One apterous viviparous female laid about 39 to163 nymphs (xˉ = 104.62±32.63) throughout a mean reproductive period of 11.89±3.33 days. On the average, one aphid lived for 17.48±3.46 days. The following natural enemies were observed to attack L. erysimi: Ischiodon escutellaris Fab. (Diptera:Syrphidae), Cheilomenes sexmaculatus Fab. (Coleoptera: Coccinellidae), Eumicromus sauteri Esben-Petersen (Neuroptera:Hemerobiidae) and Trioxys communis Gahan. (Hymenoptera:Aphidiidae). The host range and some aspects of its behavior are also discussed in this work.

Location

UPLB Main Library Special Collections Section

Call Number

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Document Type

Thesis

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