subject: effects of botanical pesticides on aphids (aphis fabae) and thrips (thrips tabaci) pests of...

SUBJECT: EFFECTS OF BOTANICAL PESTICIDES ON APHIDS (Aphis fabae) AND THRIPS (Thrips tabaci) PESTS OF FRENCH BEANS (Phaseolus

vulgaris).

SUPERVISOR: Dr. DORAH KILALO.

SEIF MATI IDRISA22/0071/2009.

©2013

The common bean (Phaseolus vulgaris) forms important food and cash crop in Africa.

They are considered the second most important source of human dietary protein after maize and third as source of calories (after maize and cassava) in Africa.

Most beans are produced by small-scale farmers for home consumption.

However, high quality dry and snap beans are exported to markets in European Union EU countries.

Most common varieties are, samantha, julia, amy, etc.

The main objective entail:- To develop a sustainable management method

for controlling aphids (Aphis fabae) and thrips (Thrips tabaci) through use of botanical pesticides.

Specific objective is:- To determine the effects of botanical pesticides

(Tagetes tephrosia, tithonia, spider plant and nimbecidine) on aphids (Aphis fabae) and (Thrips tabaci) infesting French beans.

This is to be carried out at Kabete Field Station. All agronomic practices recommended are to be

carried out. Establishment of crops is to cater for seven

treatment plots at a Randomized Complete Block Design RCBD with three replicates.

Blocks (B) Treatments (T)

B1 T7 T5 T3 T1 T6 T2 T4

B2 T6 T2 T7 T4 T3 T5 T1

B3 T2 T1 T4 T5 T6 T3 T7

Key:-•T1 – positive control•T2 – negative control•T3 – spider plant extract•T4 – nimbecidine•T5 – Tagetes tephrosia,•T6 – Tithonia•T7 – synthetic chemical (Katrin)

Physical identification of the pests both the adults and immature stages.

Counting to be carried out and the results put in record.

For the aphids it entails:- observation to commence after crop

establishment in the field. counting on three meristematic leaves per

plant from five plants per plot.

For the thrips it entails:-observation to commence during flowering

period.counting on three flowers per plant from five

plants per plot. Parameters such as date and time of collection to be

recorded at all times.

The data will be subjected to the analysis of variance. Using the Separate Fisders Protected LSD at 95% c.i. This is to evaluate the effect of the botanicals

pesticide on the pests.

2012 2013

Activity Nov Dec Jan Feb Mar Apr May

Proposal writing and presentation

Exp. Set up

Data collection

Data analysis

Report writing

Report submission

ITEMS QUALITY UNIT COST (Ksh)

French beans 2 Kg 2 000

Fertilizer DAP 5 kg 400

Katrin (insecticide)

100 ml 450

Nimbecidine 100 ml 650

Spider plant extract

4 kg 760

Tagetes 4 kg 700

Tithoni 5 kg 800

Labour 12 days 4 800

TOTAL 10 560

ASANTENI.