scholarly journals REACTION OF LEUCAENA LEUCOCEPHALA TO POPULATIONS OF MELOIDOGYNE INCOGNITA AND M. JAVANICA FROM PUERTO RICO

1969 ◽  
pp. 157-158
Author(s):  
Nydia E. Vicente ◽  
Nelia Acosta ◽  
Eduardo C. Schröder
Keyword(s):  
Puerto Rico ◽  
Meloidogyne Incognita ◽  
Leucaena Leucocephala

REACTION OF LEUCAENA LEUCOCEPHALA TO POPULATIONS OF MELOIDOGYNE INCOGNITA AND M. JAVANICA FROM PUERTO RICO

scholarly journals Reprise précoce de la forêt sèche subtropicale au sud-ouest de Puerto Rico

2011 ◽  
Vol 310 (310) ◽  
pp. 11 ◽  
Author(s):  
Peter L. Weaver
Keyword(s):  
Puerto Rico ◽  
Leucaena Leucocephala

Un inventaire de la couverture forestière et de la composition florale a été réalisé en 1998, 2003 et 2010 suite à l'élimination des pâturages et brûlis dans les 32 hectares inférieurs de la zone de Tinaja, au sein du refuge national de faune de Laguna Cartagena dans le Sud-Ouest de Puerto Rico. Les inventaires de la forêt sèche subtropicale montrent pour la période de 1998 à 2010 une augmentation de 3,9 fois pour les tiges, 6,7 fois pour les arbres, 3,3 fois pour la surface terrière et de 4,4 fois pour la biomasse, et cela avec des variations notables en fonction des sites. Sur 10 parcelles le long de la limite sud, plus proche de la couverture forestière résiduelle, ont été relevés un nombre plus important de tiges et d'arbres, une surface terrière plus grande et, en général, davantage de biomasse que sur les 22 parcelles du côté nord, et ce durant les trois années d'inventaire. Pour quatre parcelles situées dans des criques et une parcelle bordant une clôture, les valeurs sont également plus élevées que les moyennes respectives pour l'ensemble des 32 parcelles du Tinaja inférieur. Les autres tendances notables relevées pour la période de 1998 à 2010 sont les suivantes : les essences exotiques augmentent en proportion de 70 à 84 % en tiges et de 70 à 86 % en arbres ; le rapport entre tiges et arbres diminue de 2,3 à 1,3 ; Leucaena leucocephala (Lam.) DeWit augmente de 7 à 53 % en tiges et de 14 à 64 % en arbres ; Pilosocereus royenii (L.) Byles & Rowley décroît de 10 à 2 % en tiges et de 7 à 1 % en arbres, en raison surtout d'attaques d'une cochenille des cactus, Hypogeococcus pungens ; enfin, la richesse floristique des essences augmente de 30 à 34. (Résumé d'auteur)

Plant Parasitic Nematodes Associated with Plantain (Musa acuminata x M. balbisiana, AAB) in Puerto Rico

1969 ◽  
Vol 66 (1) ◽  
pp. 52-59
Author(s):  
D. Oramas ◽  
J. Román
Keyword(s):  
Puerto Rico ◽  
Meloidogyne Incognita ◽  
Nematode Species ◽  
Musa Acuminata ◽  
Parasitic Nematodes ◽  
Radopholus Similis ◽  
Plant Parasitic Nematodes ◽  
Rotylenchulus Reniformis ◽  
Phytoparasitic Nematodes ◽  
Plant Parasitic

A survey was conducted through the five argricultural regions of Puerto Rico to determine distribution and population density of the nematode species associated with plantain. Fourteen genera, represented by 19 species of phytoparasitic nematodes were found in association with the crop: Ditylenchus, Helicotylenchus, Hoplolaimus, longidorus, Meloidogyne, Paratylenchus, Pratylenchus, Pseudhalenchus, Quinisulcius, Radopholus, Rotylenchulus, Tylenchorhynchus, Tylenchus, and Xiphinema. Meloidogyne incognita, Helicotylenchus spp., Radopholus similis, and Rotylenchulus reniformis were the most widely distributed nematode species throughout the Island. On the other hand, M. incognita, P. coffeae, R. similis, Helicotylenchus spp. , and R. reniformis had higher population densities.

scholarly journals Insect and Nematode Control in Cucumber (Cucumis sativus) in Puerto Rico.

1969 ◽  
Vol 70 (1) ◽  
pp. 19-24
Author(s):  
Nelia Acosta ◽  
Carlos Cruz ◽  
José Negrón
Keyword(s):  
Puerto Rico ◽  
Meloidogyne Incognita ◽  
Chemical Control ◽  
Field Experiments ◽  
Lower Number ◽  
Nematode Control ◽  
Rotylenchulus Reniformis ◽  
Liriomyza Sativae ◽  
The Third ◽  
Cucumber Cultivar

Field experiments for the chemical control of the pickleworm (Diaphania nitidalis), the melonworm (D. hyalinata), the leafminer (Liriomyza sativae), and nematodes (Meloidogyne incognita and Rotylenchulus reniformis) on cucumber cultivar Ashley were established in two locations in Puerto Rico in 1979 and 1980. In the second test, a lower number of mined leaves was observed on methamidophos-treated plots as well as a significant lower index of leafminer damage. All chemicals controlled the pickleworm effectively. Highest yields were obtained from plots treated with the highest dosage of acephate and with the intermediate dose of methamidophos. Applications of carbofuran, acephate, methomyl and permethrin reduced the melonworm damage in the third test. Highest yields were obtained from carbofuran-treated plots. All nematicides controlled nematodes in the soil.

scholarly journals Pathogenicity of Meloidogyne incognita and Pratylenchus zeae, and Their Association with Pythium graminicola on Roots of Sugarcane in Puerto Rico

1969 ◽  
Vol 64 (3) ◽  
pp. 338-347
Author(s):  
Santos Valle-Lamboy ◽  
Alejandro Ayala
Keyword(s):  
Puerto Rico ◽  
Meloidogyne Incognita ◽  
Dry Weight ◽  
Nematode Species ◽  
Fresh Weight ◽  
Sugarcane Cultivar ◽  
Combined Action ◽  
Pratylenchus Zeae

Both Meloidogyne incognita and Pratylenchus zeae, acting separately, reduced significantly the height of the primary shoots, fresh and dry weight of shoots and leaves, and fresh weight of roots of sugarcane cultivar PR 980. The combined action of both nematode species also caused a significant reduction of the height of the primary shoots, weight of shoots and dry weight of leaves, but the reduction was less than that produced in plants inoculated with only one species alone. Also, when both species of nematodes were present simultaneously, the number of internodes was significantly reduced, as compared to the control, but there was no difference in the reduction caused by both species when they were applied together or each one alone. Pythium graminicola reduced significantly the height of primary shoots. The combination of each nematode species with the fungus produced a highly significant reduction of the height of the primary shoots. The reduction was lower than that produced by each nematode species acting separately, but higher than that induced by the fungus alone. No significant reduction was caused by the three microorganisms acting in combination. The data suggested a possible acute antagonism among the two nematode species and the fungus. It also indicated that M. incognita, P. zeae and P. graminicola are pathogenic to sugarcane.

scholarly journals Nematicidal effects of Leucaena leucocephala and Gliricidia sepium extracts on Meloidogyne incognita infecting okra

2007 ◽  
Vol 52 (1) ◽  
pp. 53-63 ◽  
Author(s):  
O.K. Adekunle ◽  
A. Akinlua
Keyword(s):  
Carboxylic Acid ◽  
Phenolic Compound ◽  
Meloidogyne Incognita ◽  
Leucaena Leucocephala ◽  
Gliricidia Sepium ◽  
Fruit Weight ◽  
Reproduction Rate ◽  
Root Knot Nematode ◽  
Nematode Reproduction ◽  
Aromatic Amide

Two separate but identical greenhouse trials were conducted to investigate the effects of extracts of leaves and roots of Leucaena leucocephala and Gliricidia sepium each at 80,000 mg / kg and 40,000 mg / kg on Meloidogyne incognita on okra. Each potted nine-day old okra seedling was inoculated with 3,000 fresh eggs of M. incognita and 5ml of each of the extracts was added simultaneously around the roots of the seedling. Treatment of okra plant with L. leucocephala and G. sepium extracts resulted in reduced nematode population, reduced galling, reduced nematode reproduction rate and enhanced fruit weight. Chemical analysis revealed that G. sepium leaves contained phenolic compound and carboxylic acid, while the roots showed the presence of aromatic amide, phenolic compound and carboxylic acid. L. leucocephala leaves showed the presence of phenolic compound, aromatic amide and carboxylic acid, while the roots showed the presence of phenolic compound and carboxylic acid. The results of this study suggest that leaf and root extracts of L. leucocephala and G. sepium at the rate of 40,000 mg / kg could be useful in root knot nematode management in vegetable beds.

scholarly journals Chemical Control of Coffee Nematodes in Seedbeds in Puerto Rico

1969 ◽  
Vol 64 (4) ◽  
pp. 474-481
Author(s):  
Rodrigo Echávez Badel ◽  
Alejandro Ayala
Keyword(s):  
Puerto Rico ◽  
Plant Growth ◽  
Meloidogyne Incognita ◽  
Chemical Control ◽  
Growth And Development ◽  
Coffea Arabica ◽  
Granular Soil ◽  
Foliar Sprays ◽  
Plant Soil ◽  
Coffea Arabica L

Pre-plant soil treatments with granular formulations and foliar sprays with the nematicides phenamiphos (Nemacur), oxamyl, (Vydate) and fensulfothion (Dasanit) reduced populations of Meloidogyne incognita and Pratylenchus coffeae in coffee (Coffea arabica L.) cv. Puerto Rico Selecto roots. Significant (P = 0.05) increases in growth and development of the treated plants were obtained in the greenhouse. Best results were obtained with 11.20 kg ai/ha of phenamiphos applied to the soil 15 days prior to planting, combined with foliar sprays of 1.12 kg ai/ha of the same systemic nematicide 15 days after transplanting or two foliar sprays with 0 .56 kg ai/ha applied at intervals of 30 days; 0.56 kg ai/ha of oxamyl applied to the foliage 30 and 60 days after transplanting; and 4 granular soil applications of 300 mg of fensulfothion at 30-day intervals. Dipping roots in a solution containing 400 p/m of phenamiphos and 600 p/m of oxamyl also reduced nematode populations in roots and soil. Significant differences in root-knot index were found among those treatments and the controls, but plant growth was not affected. The higher dosages (2.24 kg ai/ha) of phenamiphos and fensulfothion when applied to the leaves twice after transplanting were phytotoxic to the coffee seedlings resulting in early defoliation, but not killing the plants.

Puerto Rico: A Cultural Crossroads

ASHA Leader ◽  
2008 ◽  
Vol 13 (15) ◽  
pp. 38-40
Author(s):  
Albert Villanueva-Reyes
Keyword(s):  
Puerto Rico
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