Pretorius, R.J.; Louw, S. vd M.; Venter, P.; Vd. Westhuizen, C
(Journal for New Generation Sciences, Vol 10, Issue 1: Central University of Technology, Free State, Bloemfontein, 2012)
Direct feeding damage to head lettuce (Lactuca sativa L.) by varying aphid populations in two differently constructed shadehouse structures (fully- and partially covered) was examined. Fresh lettuce head weight, the number ...