Pigeonpea Plants Research Articles

Effects of Photoperiodism and Other Factors on the Improvement of Pigeonpea Varieties

Studies on the effects of photoperiodism and other factors were conducted to obtain information which might be useful in a breeding program with pigeonpeas. The information was sought for accelerating this work in a region where extremes of day-length vary by only 2 hours because of its location in latitude 18°. By shortening the length of day to 8 hours through the use of a darkroom, and planting during the month of February, it was possible to induce flower formation 4 months earlier in two early varieties and 7 weeks earlier in a late variety. However, this short-day treatment did not appreciably affect the time of flower induction in an all-season, or "Totiempo" variety. One-gallon tin-can containers and 10-inch polyethylene bags were found satisfactory for growing pigeonpea plants of different varieties.

Título en español.

En febrero de 1954 se observó una epidemia de Phoma gangrenosa que causó mucho daño a la cosecha de gandures, cultivo de gran importancia en Puerto Rico. Este estudio informa sobre el agente causal de la epidemia, que es una especie indeterminada de Phoma la cual se caracteriza por la formación de picnidios papilados de distintos tamaños. La enfermedad pudo trasmitirse a plantas saludables de gandures, por medio de la inoculación o mediante las aspersiones con suspensiones de conidios obtenidos de un cultivo puro. Se recomienda la continuación de los estudios sobre esta enfermedad.