Response of Citrus spp. germplasm from Puerto Rico grafted on two rootstocks to early infection of huanglongbing

Phytophthora citrophthora. [Distribution map].

Distribution Maps of Plant Diseases ◽

10.1079/dmpd/20056500035 ◽

1984 ◽

Author(s):

Keyword(s):

Puerto Rico ◽

Central America ◽

West Indies ◽

French Guiana ◽

New Caledonia ◽

Peninsular Malaysia ◽

Distribution Map ◽

Phytophthora Citrophthora ◽

New Distribution ◽

Citrus Spp

Abstract A new distribution map is provided for Phytophthora citrophthora (R.E. Smith & E.H. Smith) Leonian. Hosts: Citrus spp. and related genera. Information is given on the geographical distribution in AFRICA, Algeria, Angola, Egypt, Ethiopia, Kenya, Mauritius, Morocco, Mozambique, Senegal, South Africa, Tunisia, Zaire Republic (Congo), Zambia, Zimbabwe, ASIA, China (Szechwan), India (Bengal), (Gujarat), Iran, Iraq, Israel, Japan, Jordan, Korea, Lebanon, Peninsular Malaysia, Pakistan (E.), Philippines, Sabah, Sarawak, Taiwan, Thailand, Turkey (Mersin), Yemen Republic, AUSTRALASIA & OCEANIA, Australia, Cook Isl., Hawaii, New Caledonia, EUROPE, Britain (England), Corsica, Cyprus, France, Greece, Italy (S. & Sicily), Sardinia, Spain, NORTH AMERICA, Mexico, USA (Arizona, California, Gulf), (Weiss), CENTRAL AMERICA & WEST INDIES, Barbados, Costa Rica, Cuba (Ces. Mykol.), Dominican Republic, Guadeloupe, Guatemala, Haiti, Jamaica, Martinique, Panama, Puerto Rico, Salvador, Trinidad, SOUTH AMERICA, Argentina (Cordoba, Corrientes, Misiones, Parana delta, Tucuman), Brazil (Bahia, Minas Gerais, Sao Paulo), Chile, Ecuador, French, Guiana, Guyana, Peru, Surinam, Uruguay, Venezuela.

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Geotrichum candidum. [Distribution map].

Distribution Maps of Plant Diseases ◽

10.1079/dmpd/20056500124 ◽

1980 ◽

Author(s):

Keyword(s):

Puerto Rico ◽

Central America ◽

Sierra Leone ◽

West Indies ◽

Ivory Coast ◽

New Caledonia ◽

Geotrichum Candidum ◽

Distribution Map ◽

New Distribution ◽

Citrus Spp

Abstract A new distribution map is provided for Geotrichum candidum Link var. citri-aurantii (Ferrar) R. Cif. & F. Cif. Hosts: Citrus spp. Information is given on the geographical distribution in AFRICA, Egypt, Ghana, Guinea, Ivory Coast, Morocco, Mozambique, Rhodesia, Sierra Leone, South Africa, ASIA, Brunei, China, India (General), Indonesia, Israel, Japan, Philippines, Taiwan, Turkey, AUSTRALASIA & OCEANIA, Australia, Cooke Islands, Fiji, New Caledonia, New Zealand, EUROPE, Cyprus, France (S.), Italy (Sicily, Portugal, Spain, NORTH AMERICA, Mexico, USA, CENTRAL AMERICA & WEST INDIES, Jamaica, Puerto Rico, Trinidad, SOUTH AMERICA, Brazil, Peru.

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UAV color images for determination of citrus plant parameters

The Journal of Agriculture of the University of Puerto Rico ◽

10.46429/jaupr.v103i2.18226 ◽

2019 ◽

pp. 141-153

Author(s):

Sunil K. Mathanker ◽

Consuelo Estévez de Jensen ◽

Andrés M. Pagán-López ◽

Luis R. Pérez-Alegría

Keyword(s):

Puerto Rico ◽

Color Images ◽

Citrus Greening ◽

Effective Control ◽

Candidatus Liberibacter Asiaticus ◽

Citrus Plant ◽

Candidatus Liberibacter ◽

Liberibacter Asiaticus ◽

Supplemental Nutrients ◽

Citrus Spp

Unmanned aerial vehicles (UAVs) or drones are being studied for many agricultural applications. One application is plant phenotyping to reduce the time and effort required in collecting field data. This study aims to explore the use of a UAV, 4K-color camera and a commercial image analysis service to measure citrus plant parameters that are important to a crop scientist or grower with limited technical background and resources. Citrus spp. are important crops in Puerto Rico and the United States. Currently, the citrus industry is struggling to contain the devastating effects of citrus greening or Huanglongbing disease. The disease is associated with a phloem-limited bacteria, Candidatus Liberibacter asiaticus (CLAs), vectored by the Asian citrus psyllid (ACP), Diaphorina citri Kuwayama. The use of insecticides for vector control is the primary strategy used in nurseries and orchards. However, once the citrus plant is infected, there is no effective control available for the disease. In Puerto Rico this disease has reduced Citrus spp. yields by more than 50%; studies are underway to find effective control measures such as supplemental nutrients, vector management practices, planting disease-free vegetative material and protective screen structures. An experiment at the Fortuna Agricultural Experiment Substation, in Juana Díaz, Puerto Rico, was conducted to address the challenges posed by citrus greening. The experiment was established in a four-year-old grove of Tahiti lime (Citrus latifolia Tan.) on Cleopatra mandarin (Citrus reshni hort. ex Tanaka), naturally infected with Candidatus Liberibacter asiaticus. The experiment was arranged in a randomized complete block design with four replicates and three treatments: supplemental nutrients, supplemental nutrients + salicylic acid, and granular fertilization. Tree growth parameters were measured, and laboratory analyses were carried out to determine nutrient levels and disease severity levels from the leaf samples. The color camera, on board the UAV, was employed to acquire images of the experimental plot. Drone Deploy application was used for planning the UAV flights and image analysis. Field-measured plant height and canopy diameter compared well with the parameters determined from the color images. The average errors in measuring canopy diameter (14.5%) and plant height (22.4%) could be considered within an acceptable range, especially for comparing different treatments or crop varieties. However, the average errors in measuring canopy volume (47.5%) were high and can be considered unacceptable. It appears that the assumed conical shape of the trees could be one of the main reasons, besides the algorithms used in calculating plant volume, and built-in inaccuracies of the single frequency GPS (global positioning system) used in estimating altitude. Further studies could help in reducing errors and exploring other applications. The method used can be of importance in evaluating fruit trees.

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THE INTRODUCTION AND COLONIZATION IN PUERTO RICO OF BENEFICIAL INSECTS PARASITIC ON WEST INDIAN FRUITFLIES

The Journal of Agriculture of the University of Puerto Rico ◽

10.46429/jaupr.v25i1.3517 ◽

1969 ◽

Vol 25 (1) ◽

pp. 25-31

Author(s):

Kenneth A. Bartlett

Keyword(s):

Puerto Rico ◽

Mangifera Indica ◽

West Indian ◽

Psidium Guajava ◽

Beneficial Insects ◽

Citrus Spp

West Indian fruitflies are well-known pests in Puerto Rico. Two species of West Indian fruitnies (Anastrepha momhinpraeoptans Sein and A. suspensa (Loew)) are well known in Puerto Rico. The frequency of their occurrence in the fruits of mango (Mangifera indica L.), particularly in many of the introduced varieties, in guava (Psidium guajava L.), and in jobos (Spondias spp.) may be readily noted throughout the island. In addition A. suspensa attacks orainge and grapefruit (Citrus spp.).

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