Impacts of Temporal and Spatial Climatic Changes on Annual Generations of Rhopalosiphum maidis and R. padi (Hemiptera: Aphididae) in Egypt, Using Geographical Information System (GIS)

Abstract

A B S T R A C TCorn leaf aphid Rhopalosiphum maidis and bird cherry-oat aphid R. padi, attacking many host plants, which be recorded not only in most localities of Egypt but also along a year. So, numbers of generations could be calculated and predicted in all localities by employing Geographical Information System (GIS) and by exploiting calculated values of daily degree units and thresholds of development for them, with current and future thermal climatic conditions. Biannually generations' numbers of them differ from region to another, that numbers of wintery and summery generations of R. maidis ranged between 1-29 and 12-50 generations, respectively under current conditions. Expected generations numbers will changed with rates ranged between -4: 14 and -24:16 generations, respectively in 2050, and with rates ranged -3: 15 generation and -42: 17 generation, respectively in 2070. On other hand, Numbers of wintery and summery generations of R. padi ranged between 1-27 and 11-42 generations, respectively under current conditions. Finally expected numbers of wintery and summery generation in 2070 will be nearly similar to 2050, that its changing rates ranged between -3: 14 generation and -36: 16 generation, respectively. Temporal spatial distributions and variations of generation numbers in different regions and governorates of Egypt were discussed under current and future conditions. Moreover future of growing cereal crops was also discussed especially in southern reclaimed regions.

Host plant adaptability and proteomic differences of diverse Rhopalosiphum maidis (Fitch) lineages

“…Rhopalosiphum maidis (Fitch) (Hemiptera: Aphididae) is a severe sap-sucking pest on maize (Zea mays L.) that occurs globally (Foott & Timmins, 1973;Tzin et al, 2015). This insect also attacks barley (Hordeum vulgare L.) and some other cereal crops such as sorghum (Sorghum bicolor L. Moench), oat (Avena sativa L.), and wheat (Triticum aestivum L.) (Carena & Glogoza, 2004;Tabikha, 2016). In addition to physical damage on the host plant, R. maidis can also transmit viruses, including Maize dwarf mosaic virus and Barley yellow dwarf virus (Parry et al, 2012;Saksena et al, 1964;Thongmeearkom et al, 1976), which may lead to serious damages in maize production.…”

The Impact of Temperature on life-history traits of the bird cherry-oat aphid, Rhopalosiphum padi (Hemiptera: Aphididae) reared on wheat seedlings

“…Aphids are a serious insect pest problem in many cereal-growing regions of the world (Blackman and Eastop, 2000). Among the numerous aphid species found in cereals, the bird cherry-oat aphid, Rhopalosiphum padi (Linnaeus, 1758), is considered to be one of the major pests causes severe damage (Hansen, 2000;Hill, 2008;Descamps and Chopa, 2011;Tabikha, 2016). Temperature is probably the most important physical environmental variable influencing the rate of aphids' development and reproduction (Salman, 2006).…”

Predicting Field Generations of The Green Peach Aphid, Myzus persicae (Sulzer) and Its Predator, Green Lace-Wing, Chrysoperla carnea (Stephens) by Using Heat Units Accumulation and Evaluation of Some Insecticides against Their Populations

“…The occurrence of many insect species had been predicted by Degree day models, such as that of the pink bollworm, Pectinophora gossypiella (Saund.) (Yones, et al, 2012), the date palm scale, Parlatoria blanchardii (Salman, et al, 2016) and aphids (Hanula et al, 2002;Chakravarty and Gautam, 2004;Gomez et al, 2009;Cividanes and Santos-Cividanes, 2012;Tabikha, 2016), helping in the programs of integrated pest management. The current integrated pest management programs for many insect pests are dominated by the use of insecticides that typically rely on sampling, threshold and resistance information to optimize timing of applications and make best use of existing chemistry (Palumbo et al, 2001).…”