Agricultural varieties of the cowpea and immediately related species . ds in 82 days. The latestvarieties that mature at Arlington Farm require 130 days, but manyof the lots received from tropical sources do not even bloom underArlington Farm conditions. The length of time between planting and the ripening of the firstpods also varies with the time of planting. Thus, Mooersx found thatthe Whippoorwill varied in time from planting to maturity as fol-lows: Planted April 15, 183 days; May 1, 168 days; May 15, 153days; June 5, 132 days; June 17, 113 days; June 29, 101 days. The life period also va
Agricultural varieties of the cowpea and immediately related species . ds in 82 days. The latestvarieties that mature at Arlington Farm require 130 days, but manyof the lots received from tropical sources do not even bloom underArlington Farm conditions. The length of time between planting and the ripening of the firstpods also varies with the time of planting. Thus, Mooersx found thatthe Whippoorwill varied in time from planting to maturity as fol-lows: Planted April 15, 183 days; May 1, 168 days; May 15, 153days; June 5, 132 days; June 17, 113 days; June 29, 101 days. The life period also varies in some cases from season to season, notonly in actual period of time but in comparison with other varieties,as before mentioned. MALFORMATIONS. Cowpea leaves with four or five leaflets are by no means uncom-mon. The small amount of evidence available indicates that thischaracter is to some degree hereditary, probably comparable in this 1 Bulletin 82, Tennessee Agricultural Experiment 229, Bureau of Plant Industry, U. S. Dept. of Agricultur Plate VI. Pods of Catjang No. 22888.(Natural size.) THE COWPEA FLOWER AND ITS POLLINATION. 25 respect to the heredity of the 4-leaved and 5-leaved clover plants asdetermined by De Vries. A rare malformation of the leaves among cowpeas is the forma-tion of pitchers or ascidia. Some illustrations of these curiousgrowths are shown in Plate VIII. SUSCEPTIBILITY AND RESISTANCE TO DISEASES. The cowpea is affected by a considerable number of diseases, themost common being wilt {Neocosmospora vasinfecta var. nivea ) ; root-knot caused by the nematode worm (Heterodera radici-cola (Greef) Mull.); rust {Uromyces phaseoli); white leaf-spot(Amerosporium economicwn) ; red leaf-spot {Cercospora cruenta) ;and mildew (Sphaerotheca sp.). Root-knot and wilt are so commonthroughout much of the cotton belt that most cowpea varieties sufferserious damage. The Iron variety and some recently bred hybridsof Iron are completely resistant to th
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