Abstract:
Kale (Brassica oleraceae var acephala), commonly known as sukumawiki, is a crop that belongs
to the Brassicas family. The crop is highly nutritious containing high levels of vitamins, minerals
and brain-boosting phytonutrients. The crop is attacked by aphids that lower it quality thus
fetches low price in the market. The study was conducted in the University of Embu. The
location of the site lies within the geographical position 0.52S, 37.46E longitude and latitude
respectively. The study required a farm size of 32.5m that would be enough to accommodate
four treatments with each containing three replicates with spaces left for movement and
operations covering 0.5m between the plots. For each plot, planting was done at a spacing of
30cm × 30cm which accommodated 9 plants per plot and a total of 108 plants for the main plot.
The objective of the study was to investigate the effectiveness of control measure of aphids
infestation of kales under four treatments namely; T1 – Garlic solution, T2 – soap solution, T3
combination of Garlic and soap solution and T4 – being a control experiment. The data shall be
collected by counting the infestation of thrips per leaf collected randomly from the treatment
application; two weeks after the kale plants are transplanted and established whereby the records
on the aphid’s population shall be recovered with a period of five days interval for a period of
one month. Data collected was subjected to analysis of variance using SAS computer software
package and separation of means was done using least significant difference (LSD) at p<0.05. ,
combination of soap powder and garlic solution (T3) performed the best with the highest
reduction in the aphids population hence could be an option of interest in the control. Following
was soap powder solution (T2) and garlic solution (T1). It is recommended that the study be
repeated for another season to confirm the results of this study which were based on one season.
