Identification of Resistance to Insect Pests Infestations in Cotton (Gossypium hirsutum L.) Varieties Evaluated in the Field Experiment

Abstract

Abstract. Resistance against insect pests is a crucial trait for the stability and sustainability of cotton production. A field trial was conducted to quantify relative tolerance and sensitivity varying in 10 released (new and existing) cotton varieties of Nuclear Institute for Agriculture and Biology (NIAB), Faisalabad, Pakistan, against sucking and bollworm insect pest complexes. In general, it was observed that none of the cultivars were found completely resistant to pests although these originated as least susceptible, moderately susceptible and highly susceptible. Of them, N-777 was rated as more tolerant to white fly attack in comparison to N-Karishma that appeared susceptible. Variety N-9811 and Sitara-10 M carried maximum, and N-Karishma carried minimum jassid load for considering the best source for pest resistance. On the basis of mean bollworms damage values, the varieties N-Karishma, N-846 and N-852 carried less pest pressure than IR-824, Sitara-10 M and N-26 which were the most susceptible. Percent of seedling emergence was variable in most of the test genotypes. The variety N-9811 gave 99% emergence, while N-846 and N-777 conferred 95% emergence. Variety N-852 gave the poorest percent of emergence (72.99%) and the other six varieties conferred an emergence range of 94.05-83.76%. Differences in seed cotton yield were also observed, indicating that minimal and maximal pest injury on cotton influenced the crop yield. The varieties NKarishma, N-852 and N-846 performed well in respect of higher seed cotton yield. The results suggest that tolerant cotton genotypes might be commercially cultivated extensively in this agro-climatic area and Scientists involving in development of host plant resistant cultivars are encouraged to utilize resistance sources as donar against key pest species.

Screening of Cotton Varieties/Genotypes against Jassid, Amrasca biguttula biguttula (Ishida) under Rainfed Conditions

“…Khan et al, (2011) reflected that IR-443 proved to be the most successful genotype rendering lowest infestation of jassids (0.30 and 0.42/ leaf), thrips and whiteflies with highest yield (1628 and 1599 kg/acre) in both years as compared to other Bt cotton genotypes followed by IR-FH-901. Further, Sarwar et al, (2013) observed that the N-Karishma carried minimum jassid load (1.70 per leaf) considering the best for pest resistance with highest cotton production (8.53 kg per 30 m 2 ) in comparison to other ten released G. hirsutum cotton varieties. Moreover, Patel (2014) evaluated that the genotype K-3 recorded minimum jassid population and gave maximum seed cotton yield, followed by KH-121 and K-2 among fifteen hirsutum cotton genotypes screened.…”

Sowing Time Optimization for Insect Pest Management and Enhanced Crop Yield in Cotton

“…These findings align with the work of Abro et al (2003) and Ali et al (2009), who similarly observed nonsignificant variations in mean insect pest populations across tested genotypes. However, other studies such as Salman et al (2011, Sarwar et al (2013), Atta et al (2015), Asif et al (2017), andSaleem et al (2018) reported differing results, indicating significant variations in pest infestations among genotypes against both sucking and bollworm complexes.…”

Knowledge of Farmers, Constraints Faced and Suggestions Offered on Integrated Management of Pink Bollworm in Cotton: A Case of Saurashtra Region, Gujarat

“…The plants suffer from the ravages of insect pests and production both in terms of quantity and quality are jeopardized. The cotton ecosystem is very complex (Sarwar, 2016;2017) and the gelechiid moth of genus Pectinophora in the family Gelechiidae of order Lepidoptera may be associated with cotton (Sarwar et al, 2013). Among 162 species of insects and mites that associate with cotton (from seedling to harvest of the crop) in India (Anonymous, 1989).…”