Greenhouse and field evaluations of potassium phosphonate: the control of Phytophthora foot rot of black pepper in Vietnam

Foot rot disease caused by Phytophthora capsici in black pepper is the most destructive disease. A total of 82 isolates from the National Repository of Phytophthora at ICAR-Indian Institute of Spices Research were evaluated for their sensitivity to metalaxylmancozeb and also tested for their virulence. Of the 82 isolates studied, 19 (23.2%) were highly sensitive to metalaxyl-mancozeb and six (7.3%) were comparatively insensitive (EC90 value >40 ppm; range 41.3 to 68.5 ppm). The isolates also varied in the degree of virulence, viz., 34 (41.5%) were highly virulent, 39 (47.6%) moderately virulent, 4 (3.7%) mildly virulent, and 5 (6.1%) non-virulent. There was neither any significant correlation between sensitivity to metalaxyl-mancozeb and virulence nor with the geographical location.

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Phytophthora Foot Rot of Black Pepper in Brazil and Puerto Rico

Phytopathology ◽

10.1094/phyto-62-144 ◽

1972 ◽

Vol 62 (1) ◽

pp. 144 ◽

Cited By ~ 7

Author(s):

R. Alconero

Keyword(s):

Puerto Rico ◽

Black Pepper ◽

Foot Rot

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EFIKASI SERBUK TUMBUHAN DALAM MENGENDALIKAN PENYAKIT BUSUK PANGKAL BATANG LADA DI LAPANGAN

JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA ◽

10.23960/j.hptt.1215-19 ◽

2011 ◽

Vol 2 (1) ◽

pp. 15-19

Author(s):

Cipta Ginting ◽

Dad R.J. Sembodo ◽

Herry Susanto

Keyword(s):

Field Condition ◽

Block Design ◽

Phytophthora Capsici ◽

Zingiber Officinale ◽

Black Pepper ◽

Piper Nigrum ◽

Foot Rot ◽

Field Soil ◽

Fungal Propagules ◽

Whole Plants

The efficacy of plant powder to control foot rot on black pepper in field condition. One of the problems in cultivating black pepper (Piper nigrum L.) is foot rot caused by Phytophthora capsici Leonian (P. palmivora MF4), that could kill the plants in only few days especially during rainy season. The objective of this experiment was to evaluate the efficacy of several plant powder to control the disease in semi-field condition. The experiment was conducted at the experiment station located at the campus of the University of Lampung from May to October of 2000. The semi-field condition was made by pushing a barrel into the soil to isolate the field soil as testing medium from the rest of the field soil. The treatments were arranged in a randomized complete block design with five replications and consisted of the rhizomes of Zingiber officinale, Alpinia galanga, and Kaempferia galanga, whole plant of Cymbopogon citratus and Elephantopus scaber, metalaxyl, and untreated control. To prepare the plant powder, each material was cut into small pieces then dried in oven at 50o C for 4 days and then ground in a blender. The powder was applied 3 days after inoculum infestation. The powder and inoculum was mixed with soil to the depth of 12 cm so that the soil contained 2% each. After one week, four plants were planted. As additional bioindicator to detect infective inoculum, eight leaf portions were pressed into the soil so that half of the leaf was bellowed the soil line. The plants were watered and observed daily. To determine viable fungal propagules, soil sample was taken weekly for five weeks. Soil assay was done with dilution technique using PDA supplemented with rosebengal. The results of the observation show that the treatments did not influence significantly the disease intensity on leaf portions or the whole plants. There were no significant differences on viable fungal propagules in soils received different treatments.

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Karakteristik morfologi dan sebaran tipe kawin Phytophthora capsici asal lada di Pulau Jawa

Jurnal Fitopatologi Indonesia ◽

10.14692/jfi.14.5.166 ◽

2019 ◽

Vol 14 (5) ◽

pp. 166

Author(s):

Bahru Rohmah ◽

Bambang Hadisutrisno ◽

Dyah Manohara ◽

Achmadi Priyatmojo

Keyword(s):

Mating Type ◽

Phytophthora Capsici ◽

Morphological Characteristics ◽

Black Pepper ◽

Piper Nigrum ◽

Mating Types ◽

Foot Rot ◽

Distribution Map ◽

Rot Disease ◽

Special Region

Morphology characters and mating types distribution of Phytophthora capsici from black pepper in Java IslandPepper (Piper nigrum) is one of the most important spice crops in Indonesia. Recently its production declining due to infection of foot rot disease caused by Phytophthora capsici. This pathogen has two different mating types, namely A1 and A2, in which the presence of opposite two mating types is important for sexual reproduction and formation of oospores. The movement of pepper seedling from one area to another is highly facilitated alteration of mating type distribution map of P. capsici. The objectives of this research were to determine the morphological characteristics and the spread of mating types of P. capsici in Java. Morphology characters of P. capsici isolates were indicated by variation in sporangial size and shape, as well as types of colony appearance. The length (l) and width (w) of sporangium were in the range of 15.1–76.2 µm and 9.8–44.8 µm, respectively; while the l/w ratio was 1.12–2.27. Mating type assay showed that A2 type was more dominantly found than A1 type. This study found two different mating types present in the same area, i.e. Regency of Pacitan (East Java) and Regency of Sleman (Special Region of Yogyakarta). The findings of this research suggested that it is required more strict control strategy on the mobilization of black pepper seedling particularly in the area where the certain mating type is not found yet so that the emergence of new more virulent genotype of pathogen can be prevented.

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ABIOTIC STRESS TOLERANT TRICHODERMA HARZIANUM STRAIN FOR GROWTH PROMOTION AND FOOT ROT MANAGEMENT IN BLACK PEPPER

Journal of Plantation Crops ◽

10.25081/jpc.2018.v46.i1.3535 ◽

2018 ◽

Vol 46 (1) ◽

Keyword(s):

Abiotic Stress ◽

Trichoderma Harzianum ◽

Growth Promotion ◽

Black Pepper ◽

Foot Rot

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KORELASI SIFAT FISIK DAN KIMIA TANAH DENGAN INTENSITAS PENYAKIT BUSUK PANGKAL BATANG TANAMAN LADA / Correlation of Physical and Chemical Soil Characteristics with Intensity of Foot Rot Disease of Black Pepper

Jurnal Penelitian Tanaman Industri ◽

10.21082/littri.v22n2.2016.63-70 ◽

2017 ◽

Vol 22 (2) ◽

pp. 63

Author(s):

La Ode Santiaji Bande ◽

Abdul Wahab ◽

Bambang Hadisutrisno ◽

Susamto Somowiyarjo ◽

Bambang Hendro Sunarminto

Keyword(s):

Clay Fraction ◽

Chemical Properties ◽

Field Capacity ◽

Black Pepper ◽

Soil Characteristics ◽

Foot Rot ◽

Total N ◽

Chemical Soil ◽

Rot Disease ◽

Physical And Chemical

Foot rot disease of black pepper caused by Phytophthora capsici is the most destructive disease in Southeast Sulawesi. The disease intensity is 61.2%. This disease is difficult to control because the pathogen is soil borne and influenced by various complex environmental conditions. The study aimed to determine the correlation of physical and chemical soil characteristics with disease intensity of foot rot of black pepper. Disease intensity was assessed from the subplots of black pepper plantation of 15x15 m2 consisting of 36-40 plants. Soil samples were randomly taken from the rhizosphere of the plants in each sub plot, mixed and taken as a composite. The physical and chemical analyses were conducted in the laboratory of Physics and Chemistry of the Faculty of Agriculture, Gajah Mada University. Disease intensity and soil characteristics were analyzed its correlation using a path analysis. The results showed that soil fertility in the study area was low. The path analyses indicated that physical and chemical properties that correlated with low disease intensity were high cation exchange capacity (CEC), base saturation (BS), potassium and phosphor available as well as moisture at field capacity, whereas those induced disease development were high content of clay fraction, sand fraction, porosity, total N, C-organic and salinity. The control strategy for foot rot disease in Southeast Sulawesi was possibly by increasing CEC, BS, potassium and phosphor available, as well as by improvement of soil texture that can lower high fraction of clay, sand and soil porosity

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