The Nitrogen Content of Different Varieties of Peas as a Factor Affecting Infestations byMacrosiphum pisi(Kltb.) (Homoptera: Aphididae). A Preliminary Report

Abstract

The influence of varietal differences in plants on infestation by aphids has received considerable attention in control studies. Painter (14), in 1941, concluded that the composition of the available food in the host plant plays possibly the most important role in determining the relative resistance to aphid attacks. In biological studies on Aphis rumicis L., Davidson (8) found that factors that influence the physiological activity of the plant affect also the progress of aphid infestation. The same author (6) also pointed out that aphids exhibit a wide range of fecundity on different hosts. “The sap of certain varieties of beans”, writes Davidson, “appears to have a direct inhibiting effect upon the reproductive capacity of the aphids, whereas that of other varieties seems to have the opposite effect.”

Effect of cultural measures on the population density of the fruit tree red spider mite,Metatetranychus ulmi Koch (Acari, Tetranychidae)

“…that in resistant pea varieties (Pisum sativum L.) the total nitrogen content and the content of amino acids is lower than in the non-resistant varieties; the ratio of the sugar content to the nitrogen content is, however, higher (AucLAIR, 1953;AUCLA~R & MALTAIS, 1950;AUCLAm, MALTAIS & CARTIER, 1957;MALTAIS, 1951;. that in resistant pea varieties (Pisum sativum L.) the total nitrogen content and the content of amino acids is lower than in the non-resistant varieties; the ratio of the sugar content to the nitrogen content is, however, higher (AucLAIR, 1953;AUCLA~R & MALTAIS, 1950;AUCLAm, MALTAIS & CARTIER, 1957;MALTAIS, 1951;.…”

“…The connection between population expansion and the quality and quantity of the available food has been studied extensively in certain phytophagous insects, and especially in aphids (ARANT & JONES, 1951 ;AUCLAIR, 1953;MALTAIS, 1950;AUCLAIR et al, 1957;BARKER & TAUBER, 1951 ;EVANS, 1938;FRAENKEL, 1953;FRIEND, 1958;GRISON, 1958;HASEMANN, 1946;HOFFMANN, 1916 ;KENNEDY, 1958 ;MALTAIS, 1951 ;MEYAARD, 1956;MITTLER, 1957MITTLER, , 1958NUORTEVA, 1952;RODRmUEZ, 1960;VtLK & BODE, 1954).…”

Cotton fertilization using PGPR Bacillus amyloliquefaciens FZB42 and compost: Impact on insect density and cotton yield in North Benin, West Africa

“…Despite intensive mineral fertilization, crops' yield remains very low (Bationo et al, 2006). Moreover, this intensive use of mineral fertilizers provokes soil erosion, water pollution as well as plants' susceptibility to insect pests (Maltais, 1951;Strong, Lawton, & Southwood, 1984). Cotton production loss attributable to pests in West Africa averages about 40% of the potential yield and may reach 70% in some areas.…”

Factors in Resistance of Peas to the Pea Aphid, Acyrthosiphon pisum (Harr.) (Homoptera: Aphididae). I. The Sugar-Nitrogen Ratio

“…Trjrly investiprinns at Wisconsin by Searb ( 1932) showed that pea varieties differ in the number of aphids horn upon tl~ern. Results of aphid population counts in the field (Maltais, 1937(Maltais, , 1950(Maltais, , 1951(Maltais, , and unpublished technical report, 19.50-1954 for a period of 13 years gave the following average number of aphids per plant sample for each variety: Perfection, 39.6; Ilaisy, 32.6; Lincoln, 3 5.0; Laurier (H-103), 9.8; Champion of England, 1 1.8; ~\+Ielting Sugar, 16.8. …”

“…Results of aphid population counts in the field (Maltais, 1937(Maltais, , 1950(Maltais, , 1951(Maltais, , and unpublished technical report, 19.50-1954 for a period of 13 years gave the following average number of aphids per plant sample for each variety: Perfection, 39.6; Ilaisy, 32.6; Lincoln, 3 5.0; Laurier (H-103), 9.8; Champion of England, 1 1.8; ~\+Ielting Sugar, 16.8. Results of aphid population counts in the field (Maltais, 1937(Maltais, , 1950(Maltais, , 1951(Maltais, , and unpublished technical report, 19.50-1954 for a period of 13 years gave the following average number of aphids per plant sample for each variety: Perfection, 39.6; Ilaisy, 32.6; Lincoln, 3 5.0; Laurier (H-103), 9.8; Champion of England, 1 1.8; ~\+Ielting Sugar, 16.8.…”