Growth response of Zonocerus variegatus (Linnaeus) (Orthoptera: Pyrgomorphidae) nymphs to feeding at different periods of the day

Abstract : Ninety second instars were used to investigate the growth response of Zonocerus variegatus (L) (Orthoptera: Pyrgomorphidae) nymphs at three feeding periods namely 7.00am-7.00pm, 7.00pm -7.00am and 7.00am-7.00am. Nine cages were constructed and divided into groups of three tagged A, B and C; representing each of the three feeding periods studied. Three replicates per treatment with 10 nymphs per replicate were produced in a completely randomized design. The nymphs were fed with leaves of cassava (Manihot esculenta Cranz). In all the five bodily parameters measured, Z. variegatus nymphs fed better during 7.00am-7.00am period (P< 0.05) than other feeding periods; and this was followed by nymphs that were fed during 7.00am -7.00pm. Consequently, Z. variegatus nymphs recorded higher growth rates in three morphometric and one gravimetric parameter namely mean body length, mean antennal length, mean femur length, and mean body weight during 7.00am-7.00am period. Even, in the mean internotal lenght where significant difference was not shown (P>0.05), higher mean value was still shown by nymphs that were fed during 7.00am-7.00am period. This study has implicated among other factors the role of the length of time of food availability as important in growth response of Z. variegatus nymphs
Keyword : Zonocerus variegatus, nymphs, gravimetric parameters, morphometric parameters
Author(s) : , O. O. Oyegoke, A. J. Akintola, S. A. Babarinde
Downloads : 1308

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