Efficiency of Releasing Chrysoperla carnea (Stephens) and Coccinella undecimpunctata Linnaeus as Biological Control Agent against Aphis Gossypii Glover Infesting Basil (Ocimum basilicum L.) Plants

Field experiments were conducted at Qalubia Governorate, Egypt during the two successive seasons of 2014 and 2015, to study the biological impact of releasing the second larval instar of Coccinella undecimpunctata , Linnaeus  and Chrysoperla carnea (Stephens) at two levels, one and two larvae/ basil plant in comparison to azdirchachtin 3,2 % E.C at the rate 100 ml / 100 L. water against the cotton aphid, Aphis gosspyii , Glover infesting basil plants. Mean predaceous % of the two tested levels (2, 1 larvae/ basil plant) of C. carnea larvae / plant had significant differences during the two successive seasons. The mean predaceous % recorded 85.7 and 86.6 for 2 larvae / basil plant, while the mean predaceous % had 76.1 and 75.7 for one larva / basil plant of the two seasons 2014 and 2015. Also Statistical analysis indicated that significant difference between two levels (2 and 1 larvae / basil plant) of predacous C. undecimpunctata .Mean predaceous % of two tested levels of C. undecimpunctata larvae / plant had significant differences during the two successive seasons. The mean predaceous % recorded 85.1 and 88.0 for 2 larvae / basil plant, while the mean predaceous % had 79.8 and 77.7 for 1 larva / basil plant during the two seasons 2014 and 2015 respectively. Statistical analysis of the data of two predators for the two seasons 2014 and 2015 showed that there are non significant difference between C. carnea and C. undecimpunctata. The efficiency of Azdirchachtin increased gradually and had maximum value after 7 days with 97.2%. Also from 4^th inspection the efficiency decreased gradually to record 52.8% after 17 days. This means that each one of bioagent can be used in IPM program against A. gossypii.  This will decrease the application of harmful pesticides and consequently led to reduce of chemical application and residues on basil plants and allow these natural enemies to do their role in successfully in the field.