author(s)
Ahmed MH Ali, Mona MA Ali, Mohamed AA Abdel-Rahman, Azza MA Awad and Gamal H Abdel-Rahem

abstract
Whitefly Bemisia tabaci is considered a serious pest of cucurbit plant in Egypt. It feeds on leaves, flower and fruit of their host plants. It is a suitable model for adapting to the different host plant from intra and inter species. Five biochemical analysis; digestive enzymes (lipase and alpha- amylase), total protein, total carbohydrates and total lipids were carried out to study the effect of three cantaloupe cultivars (Ideal V1, Sundown V2 and Primo V3) on the fourth instar (pupa) of whitefly. The obtained results revealed that whitefly pupa (fourth instar) feed on Primo V3 plant cultivar were found to contain 0.149±0.007, 0.32 ±0.028, and 0.53 ±0.017mg/g fat body weight (F.B.W) in total protein, carbohydrate and lipids respectively, and 0.42 ± .0098, 0.79± 0.017 u/g protein F.B.W of lipase and amylase respectively. These results showed a significant difference than the pupa of whitefly fed on Ideal V1 plant cultivar. whereas, pupa of whitefly fed on Ideal V1 plant cultivar were found to contain (0.106±0.0063, 0.234±0.009, and 0.44±0.011mg/g F.B.W of total protein, carbohydrate and lipids respectively, and 0.38± 0.0057 and 0.50± 0.076 u/g protein F.B.W of lipase and amylase respectively. On the other hand, whitefly pupa feed on Primo V3 has a slight different than insects fed on Sundown V2 plant cultivar (0.129±0.0052, 0.273±.0.007 and 0.49±0.010mg/g F.B.W of total protein, carbohydrate and lipids respectively and 0.42±.008 and 0.75± 0.037 u/g protein F.B.W of lipase and amylase respectively. The current study suggests that B. tabaci biotypes utilize different biochemical strategies when encountering various host shifts.