http://archive.saulibrary.edu.bd/handle/123456789/5602 2026-09-17T10:53:34Z http://archive.saulibrary.edu.bd/handle/123456789/5610 EFFICACY OF SOME CHEMICAL INSECTICIDES IN COMBINATION WITH SUITABLE WETTING AGENTS AGAINST MANGO MEALYBUG Amin, Ruhul The experiment was conducted at Entomology laboratory of Sher-e-Bangla Agricultural University with the following treatments to understand the efficacy of different insecticidal combination with wetting agents against nymph and adult of devastating mango mealybug. The treatments consist of T 1 = Nitro 505 EC + Petroleum oil, T = Nitro 505 EC + Ethyl alcohol, T 3 = Nitro 505 EC + Detergent, T 4 2 = Capture 75 WG + Petroleum oil, T = Capture 75 WG + Ethyl alcohol, T 6 = Capture 75 WG + Detergent, T = Imitaf 20 SL + Petroleum oil, T 8 = Imitaf 20 SL + Ethyl alcohol, T 9 7 = Imitaf 20 SL + Detergent. The study examined the mortality rate of mealybugs by treating those combinations. Treatment T consistently showed the highest nymphal mortality rates across different application times, significantly outperforming other treatments. Conversely, T exhibited the lowest control of first instar nymphs, with notably fewer nymphs controlled after 48 hours compared to other treatments. T 3 and T 9 6 also showed significant results in nymphal mortality, gradually increasing over time. While T initially showed high nymphal mortality, it revealed statistically similar results to T 1 , T 2 5 , T 4 , T 7 , and T 8 . T performed the poorest, with the lowest control of second instar nymphs after 48 hours, while T 9 3 and T also demonstrated lower efficacy. Regarding adult mealybugs, mortality rates were lower compared to nymphs, attributed to the development of a protective waxy layer. Treatment T 6 showed the highest control of adult mealybugs, followed by T 2 5 , with statistically significant differences observed. T exhibited the lowest control, significantly different from T . Despite slight increases over time, all treatments resulted in significantly lower numbers of adult mealybugs compared to the initial 12-hour application period. Overall, the study highlights the differential efficacy of treatments in controlling mealybug nymphs and adults, with T 5 showing consistent effectiveness against nymphs and T being most effective against adult mealybugs. 5 8 8 5 6 2026-06-01T00:00:00Z http://archive.saulibrary.edu.bd/handle/123456789/5609 EFFICACY OF BOTANICALS AGAINST PULSE BEETLE (Callosobruchus chinensis L.) IN CHICKPEA UNDER DIFFERENT STORAGE MATERIALS Banu, Mst. Nur Mohal Akhter Four storage structures bin C 1 = Plastic jar, C 2 = Aluminium sheet bin, C = Jute bag with polythene lining and C 4 = Jute bag (without polythene lining) and five botanicals B = Neem oil, B 2 = Mustard oil, B 3 = Karanja leaf powder, B 4 = Nishinda leaf powder, B = Banokalmi leaf powder, B = Untreated control were evaluated for their effect on the incidence of pulse beetle, Callosobruchus chinensis infesting gram seeds in storage. The experiment was conducted in a Completely Randomized Design with 2 factors included 4 replications. Highest eggs (59.75 eggs/100seeds) were found in C 6 (Jute bag without polythene lining) and lowest eggs (28 eggs/100 seeds) in C 1 4 3 5 (Plastic jar) and (13.38 eggs/100 seeds) in B (Mustard oil). In combined effect highest eggs (100 eggs/100seeds) were found in C which was statistically similar with C 3 B 6 and C 2 B 6 . Lowest eggs were found in C combination. Weight loss was found lowest (6.45 g) in C (Plastic jar). Highest weight loss (21.80 g) was found in C 4 1 (Jute bag without polythene lining). In case of combination, weight loss was found lowest (1.53g) in C 1 B combination. The least per cent infestation and weight loss in storage was found in plastic jar with treated by mustard oil. 2 1 1 1 B B 2 6 2 2026-06-01T00:00:00Z http://archive.saulibrary.edu.bd/handle/123456789/5608 ECO-FRIENDLY MANAGEMENT PRACTICES AGAINST CAPITULUM BORER AND TOBACCO CATERPILLAR OF SUNFLOWER Akter, Tahmina The experiment was conducted in the field of Sher-e-Bangla Agricultural University farm, Dhaka, Bangladesh during the period from November 2022 to April 2023. The experiment consists of eight treatments such as T = Set up pheromone traps @ 12 Nos./ha and change the septa once in 3 weeks.+ release of egg parasitoid, (Trichogramma spp).; T 1 = Field sanitation + Inundative release of egg parasitoid Trichogramma spp. and larval parasitoid, Microbracon sp ; T = Mechanical control + carbaryl 50 WP @ 2 gm/L of water at the 10 days interval; T 4 3 = Yellow sticky board + Restrict migration of larvae by digging a trench 30 cm deep and 25 cm side with perpendicular sides around the infested fields; T = Yellow sticky board + Spraying 0.2% Borax + 0.2% ZnSO 4 @ 2 gm/L of water.; T = Spraying Chlorpyriphos 20EC @ 2-3 ml/L of water at the 10 days interval; T = Spraying Anterio (Bacillus thuringiensis + Abamectin) @ 1.5 gm/L of water at the 10 days interval and T 7 = Untreated control. The experiment was laid out in Randomized Complete Block Design with three replications. The overall result indicates that the effect of different managements decreased the incidence of insect pests (capitulum borer and tobacco caterpillar) of sunflower compared to control T 8 treatment. In T 3 treatment, the lowest leaf infestation, percentage of infestation and reduction over control caused by capitulum borer (3.26, 7.16 % and 72.50%) at reproductive stage of sunflower were recorded in T treatment. In case of tobacco caterpillar, percentage of leaves infestation at the vegetative (2.12, 8.95 % and 75.13%) and at the reproductive stage (4.58, 16.86 % and 60.43%) occurred. In case of yield contributing characters of sunflower, the highest of head/ capitulam diameter (9.93 cm), height of plant per plot (196.18 cm), leaf width (14.59 cm), leaf length (22.99 cm), area of leaves per plant (67.23 cm) and n umber of leaf per plant (24.55), number of total head per plot (29.83), number of seed per head (525.56), weight of single seed (1.03 mg), and weight of seed per head (54.96 gm) of sunflower were observed in T 3 1 treatment which was statistically different from all other treatments. Again, the highest sunflower yield (1.95 kg/plot or 2.48 ton/plot) was also observed from T 3 treatment. So, T (Mechanical control + carbaryl 50 WP @ 2 gm/L of water at the 10 days interval) was an eco-friendly pest management practice for sunflower which significantly reduce pest infestation and gave quality yield. 2026-06-01T00:00:00Z http://archive.saulibrary.edu.bd/handle/123456789/5607 MORPHOMETRIC STUDY ON LADYBIRD BEETLES COLLECTED FROM DIFFERENT INTENSIVE VEGETABLE GROWING AREAS Rahman, Md. Mizanur Executive Summary The ladybird beetle family is a significant group of beetles because they play a significant role in biological control and are key universal predators. Ladybird beetle biodiversity in Bangladesh hasn't been thoroughly studied geographically. In light of this, the current study was carried out to investigate the ladybird beetle fauna in different intensive vegetable growing areas of Bangladesh. Samples were collected from 6 distinct vegetable growing localities of Bangladesh namely Jashore, Rangpur, Pabna, Jamalpur, Mymensingh and Narsingdi. Collection surveys were done in these locations at intervals of fifteen days. There are eight species according to the identification of the specimens which were grouped under six genera of ladybird beetles. These species include Coccinella transversalis, Coccinella californica, Coccinella fulgida, Cheilomenes sexmaculata, Menochilus sexmaculatus, Chilocorus sp., Cycloneda sanguinea, and Brumoides suturalis. Analysis of the numerical data revealed that C. transversalis, Cheilomenes sexmaculata, and Menochilus sexmaculatus exhibited high levels of abundance, collected from all surveyed localities. In contrast, the remaining species demonstrated moderate levels of abundance with the exception of Coccinella fulgida and Brumoides suturalis those were exclusively collected from the Narsingdi locality. 2026-06-01T00:00:00Z