Abstract
Whenever the determination of yield loss and economic injury levels are essential tools for initiating integrated pest management (IPM) programs in the maize field, the assessment of compensatory yield is very important for determinate the accurate losses in the field and the recovery power for the maize verity. The present study aimed to estimate the yield losses of three maize varieties due to Sesamia critica and Ostrinia nubilalis, infestation; regression between maize yield losses and percent of infestation and determine the compensatory yield arising in intact plants as a result of absence or dead (caused by infestation) of adjacent plants under field conditions in El-Behiera governorate. The present results showed that yield losses resulting from S. cretica infestation in early sowed maize ranged from 5.29 – 32.17%. In case of maize that sowed in recommended date “June”, yield losses due to S. cretica was slightly decreased, and it accompanied with O. nubilalis infestation in two fields, which increased the total yield losses. A simple linear regression turned out between the percentage of infestation of S. cretica or O. nubilalis and percentage of yield losses, with R2 values 0.84 and 0.45, respectively. The yellow corn was more tolerant to stem borers infestation than white corn with percentages of increase rate in compensatory yield 27.07 %. Whenever the determination of yield loss and economic injury levels are essential tools for initiating integrated pest management (IPM) programs in the maize field, the assessment of compensatory yield is very important for determinate the accurate losses in the field and the recovery power for the maize verity. The present study aimed to estimate the yield losses of three maize varieties due to Sesamia critica and Ostrinia nubilalis, infestation; regression between maize yield losses and percent of infestation and determine the compensatory yield arising in intact plants as a result of absence or dead (caused by infestation) of adjacent plants under field conditions in El-Behiera governorate. The present results showed that yield losses resulting from S. cretica infestation in early sowed maize ranged from 5.29 – 32.17%. In case of maize that sowed in recommended date “June”, yield losses due to S. cretica was slightly decreased, and it accompanied with O. nubilalis infestation in two fields, which increased the total yield losses. A simple linear regression turned out between the percentage of infestation of S. cretica or O. nubilalis and percentage of yield losses, with R2 values 0.84 and 0.45, respectively. The yellow corn was more tolerant to stem borers infestation than white corn with percentages of increase rate in compensatory yield 27.07 %.
Highlights
Maize, Zea mays L. (Graminae: cereals) is an important grain food and industrial cereal (FAO, 1998)
In case of maize that sowed in recommended date “June” the yield losses due to S. cretica was slightly decreased and it accompanied with O. nubilalis infestation in two fields, which increased the total yield losses
The present results indicated that yield losses due to S. cretica was higher in field early sowed in May than that recommended sowed in June and late sowed in July.These results were confirmed by Abd El-Rahman, (2002) who indicated that infestation by S. cretica was slightly higher, on all tested genotypes, in early plantation of May than in late plantation of July
Summary
Zea mays L. (Graminae: cereals) is an important grain food and industrial cereal (FAO, 1998). The economic importance of maize was increased since it is used for human, livestock's and poultry consumption; it was used as a source of industrial raw material for the production of oil, alcohol and starch It sawed under a wide range of environmental conditions, so it contributed greatly to the growth of many developing countries (Andeet al., 2008 and Mbahet al., 2009). (Noctuidae), Ostrinia nubilalis (Hb.) (Pyraustidae) and Chilo agamemnon (Bles.) (Crambidae) were the most important varieties of insect pests in Egypt (Metwally, 2015 and Massoudet al., 2016) They attack the maize plants throughout the different growth stages, and caused percentages of yield losses,39.25 and 53.62% for 2014 and 2015 seasons, respectively (Massoud et al, 2016). Sesamia cretica Led and Ostrinia nubilalis Hub are regarded among the major factors causing great damage, yield loss and affecting the productivity of growing maize plants (Abd El-Gawad et al, 2002)
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