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Comparative Efficacy of Some Double Functioned Insecticides with Standard Practice 2011-12

HMS Azad
Scientific Officer (Entomology)
Cotton Research Farm Sadarpur Dinajpur.

Abstract/ Executive Summary:

Three chemicals viz. Sobicron-425Ec (Oregano phosphates + Cypermethrin), Nitro-505Ec (Cloropyrephos + Cypermathrin) and Volumeflaxi-40wg (Thiamethoxam + Chlorntraniliprole) along with standard practice (Actara-25wg + Wander-5WD) were used for controlling sucking and chewing pests of cotton (Heliothis and Earas) during 2011-12. These chemicals showed significant efficacy on cotton pests and benefit cost ratio (BCR) of the chemicals were higher than standard practice.

Keywords: Efficacy, Unilateral, Predator, Abundance, BCR

Location: Sadarpur, Sreepur and Jogodishpur cotton farm of the Cotton Development Board of Bangladesh

Start Date: 00-00-2011

End Date: 00-00-2012

Program Area: Pest Management

Commodity: Insecticide

Objectives:

To boost up the high index of seed cotton yield.

Methodology:

This study was conducted at Sadarpur, Sreepur and Jogodishpur cotton farm of the Cotton Development Board of Bangladesh. Seeds CB-10 variety were sowing on 17 July 2011. The experiments were conducted in randomized block design following three replications. The plot dimensions were 10x 10m and paths between two plots were 1 m wide. The treatments were- Sobicron-425Ec, Nitro-505Ec, Volumeflaxi-40wg and Standard practice (Actara-25wg + Wander-SWD). Application of fertilizers and other intercultural operations were done as farm standard (Urea-175kg, TSP-200kg, MOP-210kg, Zypsum-80kg, MgS0₄-15kg, Zinc Sulfate-15kg and Borax-15kg/ha.). Scouting was done once in a week and twice at the peak of the infestation period. For scouting 5 plants were considered from each replication by random selection. The presence of aphid was estimated on a scale of 0-4 (0 = no aphid, 1 = a few aphids i.e. < 10 in total, 2 = one leaf or growing point infested, 3 = more than one leaf or growing point infested, and 4= entire plant heavily infested). For chewing insects, the whole plants were examined and examination was started from the bottom of the plants. The upper and lower surfaces of the leaves, the joint of the stems, leaf stalk, branches, buds, flowers and bolls were carefully checked. If a bud or boll contained larvae it was cut and opened for accurate identification of the larvae. It was examined the plants with the sun from behind to avoid the glare from the leave surfaces while providing ample light to see the presence of any insects. Threshold levels for major pests were Jassid-2 nymph/plant, Aphid grade 1.5/plant and Bollworms-0.25 larva or 0.50 eggs / plants. Predators especially the lady beetle was counted from the selected plants. Spraying was done at the threshold level of the pests using a knapsack sprayer having the capacity of 10 liter water. A total volume of 200 liter water was applied per hectare area. In all circumstances, it was maintained 2-3-bar pressure with walking speed 1 m/sec; keeping the nozzle 25-30 cm apart from the line in favor of the wind for effective swath and coverage as the droplets can reach to the target. Normally spraying was done in between 9.00 - 10.00 am or 2.30 -3.30 pm to avoid the hottest hours of the day for less drifting and detoxification. In case of sucking pests all treatments were sprayed at a time considering as a single unit. The amount of chemical was measured carefully by the measuring cylinder and poured to the spray tank for proper mixing. Spray log (date of spray, chemical, amount of chemical, spray volume, equipment used and time of application) was maintained. It was maintained for what actually happened in the field or was intended to happen. Weekly pest's summaries, weekly picks and yield data were recorded. All cotton weighed at the same time to avoid the hygroscopic effects. Cotton was harvested from the inner rows of the plots excluding the border rows to calculate the yield/ha. The benefit cost ratios were calculated by dividing the net return by total variable costs of each treatment.

Source of Information: Annual Research Report, June 2012, (Cotton Development Board)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The Volume flaxy is the latest double functioned insecticide used for controlling sucking and chewing pests of cotton. This chemical significantly reduced pest populations at different locations and showed advantages of controlling pests throughout the season. Hence, it can be suggested for controlling both sucking and chewing pest of cotton in Bangladesh.

Knowledge Management: Report/Proceedings