scholarly journals Relative Abundance and Yield Loss Assessment of Lentil Aphid, Aphis craccivora Koch in Relation to Different Sowing Dates

1970 ◽  
Vol 4 (1) ◽  
pp. 101-106 ◽  
Author(s):  
Md. Altaf Hossain ◽  
Jannatul Ferdous ◽  
MMR Salim
Keyword(s):  
Relative Abundance ◽  
Yield Loss ◽  
Aphis Craccivora ◽  
Aphid Population ◽  
Loss Assessment ◽  
Protection Measures ◽  
Aphid Infestation ◽  
Yield Loss Assessment ◽  
Sowing Dates ◽  
Aphis Craccivora Koch

Relative abundance of lentil aphid, Aphis craccivora Koch were investigated and yield loss assessment at different sowing dates during rabi season of 1999-2000 and 2000-2001 at Ishurdi Bangladesh. Lentil aphid appeared in field in the first week of January. The maximum aphid population (15.82/twig) was recorded in the first week of February 2000-2001, but the population reached to the peak was in the last week of January in 1999-2000, subsequently rainfall caused a sudden reduction of aphid population in latter dates. Aphid population and infestation increased with the delayed dates of sowing. The crop sown in November received less aphid infestation and consequently produced higher yield than the crop sown in December. During 1999-2000, the avoidable yield loss due to aphid infestation was recorded 0.90 to 6.78% and in 2000-2001 it was 2.65 to 9.00% depending on the different dates of sowing. Avoidable yield loss was less in November sowing crop than the crop sown in December. On the other hand, yield increased by 0.91 to 7.27% and 2.72 to 9.89% in 1999-2000 and 2000-2001 respectively, due to protection measures taken against aphids and this was also depend on different dates of sowing. Key words: Lentil aphid, delayed sowing, infestation, yield.

scholarly journals Stability of Sources of Resistance to Cowpea Aphid (Aphis craccivora Koch, Hemiptera: Aphididae) across Major Cowpea Production Zones in Ghana

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Francis Kusi ◽  
Jerry A. Nboyine ◽  
Patrick Attamah ◽  
Justice F. Awuku ◽  
Issa Sugri ◽  
...  
Keyword(s):  
Yield Loss ◽  
Aphis Craccivora ◽  
Seedling Stage ◽  
Yield Losses ◽  
Sources Of Resistance ◽  
Aphid Infestation ◽  
Resistant Cultivars ◽  
Cowpea Aphid ◽  
Aphis Craccivora Koch ◽  
The Stability

Aphids (Aphis craccivora Koch) are an important vegetative stage pest of cowpea in Africa. The use of resistant cultivars is among the best management option for this pest, but the success of this strategy is influenced by the stability of the resistant genotype to the cowpea aphid biotypes present in the major cowpea growing areas in a country. This work, therefore, aimed at identifying cultivars/genotypes with stable resistance to aphid infestation across different cowpea growing ecologies in Ghana and estimating yield loss due to aphid infestation at the seedling stage. To ascertain the stability of aphid-resistant cultivars/genotypes, four cultivars/genotypes (SARC1-57-2, SARC1-91-1, IT97K-499-35, and Zaayura) and a susceptible check (Apagbaala) were tested across 18 locations in Ghana. An on-station experiment was used to quantify yield losses due to aphid attack at the seedling stage in the five cultivars/genotypes mentioned above together with 5 additional cultivars/genotypes [i.e., IT99K-573-3-2-1, IT99K-573-1-1, Padituya, Resistant BC4F3 (Zaayura//(Zaayura × SARC1-57-2)), and Susceptible BC4F3 (Zaayura//(Zaayura × SARC1-57-2))]. The results showed that SARC1-57-2 was stable in all ecologies, in terms of its resistance to aphids; it had high vigour score (3.8 ± 0.03) and low plant mortality (3.7 ± 0.22%) compared to the susceptible genotypes. The number of days to flowering and maturity were significantly higher in aphid-infested plants than in the uninfested ones. Grain yield loss was estimated to range between 3.8 and 32.8%. Except for SARC1-57-2, Resistant BC4F3, and Padituya, the remaining cultivars/genotypes sustained significant yield losses under aphid infestation. Thus, the aphid-resistance gene in SARC1-57-2 is stable against aphids. This resistance genotype can be incorporated into cowpea improvement programmes to breed for aphid-resistant cultivars. Also, the cultivation of such improved cultivars will reduce pesticide usage in cowpea production.

scholarly journals Field Screening of Lentil Genotypes against Aphid Infestation in Inner Tarai of Nepal

2020 ◽  
Vol 6 ◽  
pp. 79-84
Author(s):  
Saraswati Neupane ◽  
Subash Subedi ◽  
Rajendra Darai
Keyword(s):  
Grain Yield ◽  
Research Program ◽  
Lens Culinaris ◽  
Grain Legumes ◽  
Research Field ◽  
Aphid Population ◽  
Plant Spacing ◽  
Aphid Infestation ◽  
Plot Size ◽  
Aphis Craccivora Koch

Twenty lentil (Lens culinaris Medik) genotypes received from Grain Legumes Research Program, Khajura, Banke were screened for relative tolerance against aphid (Aphis craccivora Koch.) at the research field of National Maize Research Program, Rampur, Chitwan during winter seasons of two consecutive years 2016 and 2017. The design of the experiment was Randomized Complete Block having three replications. The unit plot size was 4m × 1 m with 25cm row to row spacing and continue plant to plant spacing was maintained and net harvested plot was 4 square meters. The recommended dose of fertilizer was 20:40:20 N:P2O5:K2O kg/ha and seed rate 30 kg/ha. Insect data were collected based on aphid population found at apical twigs (10 cm) per plant and scoring was done during flowering and pod formation stage. The grain yield was recorded. All screened genotypes differed significantly (p<0.05) on aphid population and grain yield.  Genotypes, ILL 9924, RL 83, ILL 10856, ILL 6458 and RL 67 were less susceptible with higher grain yield. These results have important implications for the development of aphid tolerant high yielding lentil variety in inner Tarai of Nepal.

Population dynamics of Aphis craccivora (Koch) and its natural enemies on bean crop in relation to weather parameters in Vadodara, Gujarat, India

2016 ◽  
Author(s):  
Ruchika Kataria ◽  
Dolly Kumar
Keyword(s):  
Population Dynamics ◽  
High Temperature ◽  
Aphis Craccivora ◽  
Aphid Population ◽  
Agricultural Fields ◽  
Biotic Factors ◽  
Aphis Craccivora Koch ◽  
Weather Parameters ◽  
Abiotic And Biotic Factors ◽  
Bean Crop

The studies on the population dynamics of Aphis craccivora (Koch) were conducted during 2008-2011. This pest is a serious pest in the agricultural fields of Vadodara, India. The results showed that the aphid population was higher in the month of September to January on bean crop. The maximum population of Aphis craccivora (Koch) was seen in the month of January to March. The correlation of the aphid population was done with abiotic and biotic factors. The aphid population was showing positive correlation with high temperature and the population of predators and other associated insect was showing negative correlation with minimum temperature, relative humidity and rainfall. Hence the information contained in this paper lead to the identification of the proper integrated pest management (IPM) practises for Aphis craccivora (Koch) management.

scholarly journals Yield Loss Assessment and Determination of Control Thresholds for Anthracnose on Red Pepper

2015 ◽  
Vol 21 (1) ◽  
pp. 6-11 ◽  
Author(s):  
Ju-Hee Kim ◽  
Seong-Soo Cheong ◽  
Ki-Kwon Lee ◽  
Ju-Rak Yim ◽  
Sun-Woo Choi ◽  
...  
Keyword(s):  
Yield Loss ◽  
Red Pepper ◽  
Loss Assessment ◽  
Yield Loss Assessment
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