Abstract:
The experiment was conducted at the field laboratory of Sher-e-Bangla Agricultural
University, Dhaka during the period from November, 2013 to March, 2014 to find out the
efficacy of different management practices against jassid in okra. The treatments
comprised two botanical products, two synthetic chemical insecticides along with soap
and detergent and one untreated control. These treatments are T1 = Spray with soap @
3g/L of Water at 7 days interval; T2 = Spray with neem oil @ 4ml+Trix (detergent) @ 10
ml/L of water at 7 days interval; T3 = Spray with neem seed kernel water extract @ 20g/L
of water at 7 days interval; T4 = Spray with (Fenitrothion) Sumithion 50EC@ 1ml/L of
Water at 7 days interval; T5= Spray with Admire 200SL@ 0.5ml/L of water at the 7 days
interval and T6= Untreated Control. The experiment was laid out in Randomized
Complete Block Design (RCBD) with three replications. The data were recorded on fruit
infestation by number, weight and diameter of individual fruit at early, mid and late
fruiting stages; and yield related attributes as well as yield of okra. Among six treatments,
T5 treatment (Admire 200SL) reduced the highest percent (88.46 %) of fruit infestation
by number and fruit infestation by weight (85.94 %), followed by T2 treatment (neem oil
+ trix) 77.73% and 75.39% respectively, whereas T1 treatment (soap water ) showed the
least performance, 32.05% and 30.83% respectively by number and weight. Considering
plant and yield related attributes, maximum height of plant (132.97), length of fruits
(10.89), and diameter of fruits (1.188) were recorded in T5 treatment over control
followed by T2. Similarly the highest fruit yield (23.39 ton/ha) was also achieved by the
application of Admire 200SL with the increase of 60.21% yield over control whereas
soap water showed least yield (15.89 ton/ha), followed by Sumithion 50EC (19.03). Okra
yield increased due to increases of fruit length, diameter and plant height; on the other
hand fruit yield decreased due to increase of fruit infestation by number and weight. The
chemical insecticide Admire 200SL is the most effective in controlling jassid. Among
other treatment Neem oil+ trix performed better to control jassid in okra. Considering
Benefit Cost Ratio (BCR) and environment aspect, it may be suggested that neem oil+
trix, neem seed kernel water extract and use of soap water may be suitable option than
other control.
Description:
A Thesis
Submitted to the faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfillment of the requirements for the degree of
MASTER OF SCIENCE (MS)
IN
ENTOMOLOGY
SEMESTER: JANUARY-JUNE, 2014