scholarly journals Biodegradable twines in horticulture : Greenhouse test tomato - contact with dealers and composters

2020 ◽  
Author(s):  
Barbara Eveleens ◽  
◽  
Chris Blok
Keyword(s):  
Greenhouse Test

scholarly journals Morpho-molecular identification and pathogenicity test on fungal parasites of guava root-knot nematode eggs in Lampung, Indonesia

2020 ◽  
Vol 21 (3) ◽  
Author(s):  
I Gede Swibawa I Gede ◽  
YUYUN FITRIANA ◽  
SOLIKHIN ◽  
RADIX SUHARJO ◽  
F.X. SUSILO ◽  
...  
Keyword(s):  
Molecular Identification ◽  
Morphological Characteristics ◽  
Pathogenicity Test ◽  
Root Knot Nematode ◽  
Commercial Products ◽  
Tomato Plants ◽  
Greenhouse Test ◽  
Nematode Eggs ◽  
Fungal Parasites

Abstract. Swibawa IG, Fitriana Y, Solikhin, Suharjo R, Susilo FX, Rani E, Haryani MS, Wardana RA. 2020. Morpho-molecular identification and pathogenicity test on fungal parasites of guava root-knot nematode eggs in Lampung, Indonesia. Biodiversitas 21: 1108-1115. This study aimed to obtain and discover the identity of the species of fungal egg parasites of root-knot nematodes (RKN), which have a high pathogenic ability causing major losses in vegetable crops. The exploration of the fungi was carried out in 2016 and 2018 from Crystal guava plantations in East Lampung, Central Lampung, Tanggamus, and NirAma, a commercial product that has been used for controlling Meloidogyne sp. in Indonesia. Identification was carried out based on morphological characteristics and molecular-based gene sequential analysis of Intergenic Transcribed Spacer (ITS) 1 and ITS 4. A pathogenicity test was carried out in vitro and in a greenhouse using tomato plants as indicator plants. In the in vitro test, observations were made on the percentage of infected RKN eggs. The observations in the greenhouse test were carried out on RKN populations in the soil and roots of tomato plants, root damage (root knots), and damage intensity due to RKN infection. The exploration resulted in five isolates of fungal egg parasites of RKN from the guava plantations in East Lampung (2), Central Lampung (1), Tanggamus (1), and from the isolation results of commercial products (1). The isolates were given codes as B4120X (PT GGP PG1), B3010 (PT GGP PG4), B412G (PT GGP PG 4), B01TG (Tanggamus), and BioP (Commercial products). Based on their morphological characteristics, the isolates were classified into the genus of Paecilomyces. The results of molecular identification showed that the discovered fungi were Purpureocillium lilacinum (Thom.) Luangsa Ard. (Syn. Paecilomyces lilacinus (Thom.) Samson.). Based on the in vitro tests, the five fungal isolates were able to parasitize RKN eggs at 86.4-100%. In the greenhouse test, all isolates significantly suppressed nematode populations in the soil and tomato roots, inhibited the formation of root knots, and produced lower damage intensity compared to controls. Among all the isolates tested, B01TG had the best ability to infect nematode eggs (99.5%), suppressing the formation of root knots, nematode population in the soil and the roots of tomato plants, and the damage intensity compared to other isolates.

EFFECTS OF SELECTION FOR SPEED OF GERMINATION ON ESTABLISHMENT, VIGOR, AND YIELD IN ALTAI WILD RYEGRASS

1977 ◽  
Vol 57 (4) ◽  
pp. 1085-1090 ◽  
Author(s):  
T. LAWRENCE
Keyword(s):  
Field Test ◽  
Seed Yield ◽  
Dry Matter ◽  
Germination Index ◽  
Dry Matter Yield ◽  
Stand Establishment ◽  
Greenhouse Test ◽  
Selection For ◽  
Two Populations

Selection for fast and slow germination in Altai wild ryegrass (Elymus angustus Trin.) through three cycles of selection resulted in significant differences in the speed of germination index between the two populations. The fast germinating population established significantly better in a field test than the slow germinating population. Significant differences, although not large, were also found between the populations for spring vigor, seed yield and dry matter yield. However, observations from a greenhouse test indicate that these differences were attributable to differences in stand establishment in the field test rather than directly attributable to selection for speed of germination. It is suggested that selection for fast germination would be useful in breeding better establishing strains of Altai wild ryegrass. This would have little effect on either spring vigor or yield of seed and forage.

A GREENHOUSE TEST FOR CHARACTERIZING PPV-STRAINS

1995 ◽  
pp. 376-382 ◽  
Author(s):  
E. Fuchs ◽  
M. Grüntzig ◽  
G. Krczal ◽  
U. Avenarius ◽  
H. Kegler
Keyword(s):  
Greenhouse Test

EFFICACY OF EARLY SELECTION FOR FIRE BLIGHT RESISTANCE AND THE ANALYSIS OF COMBINING ABILITY FOR FIRE BLIGHT RESISTANCE IN SEVERAL PEAR PROGENIES

1990 ◽  
Vol 70 (3) ◽  
pp. 905-913 ◽  
Author(s):  
H. A. QUAMME ◽  
F. KAPPEL ◽  
J. W. HALL
Keyword(s):  
Combining Ability ◽  
Fire Blight ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Maximum Likelihood Estimates ◽  
Blight Resistance ◽  
Stages Of Growth ◽  
Greenhouse Test ◽  
Selection For ◽  
Made In

A set of progenies was tested for fire blight resistance by needle inoculation at 3 mo of age in the greenhouse and then 5 yr later in the orchard to determine if the measurements of fire blight resistance made in the greenhouse was correlated with those made in the field. The correlation of fire blight resistance at the two stages of growth was weak or absent on a single plant basis. This indicated a lack of precision in the greenhouse test but genetic gain based on the field measurements appeared to be possible if plants were selected in the greenhouse with less than 19% of blighted shoot length. In another set of progenies, the greenhouse test was observed to delay fruiting, but the delay was not greater than 1 yr. It is proposed that selection for fire blight be carried out at both stages of growth, in the greenhouse as single measurements on young plants and again in the field when repeated measurements can be made. Maximum likelihood estimates of the variance components determined on data that were transformed by arc sine of the square root and corrected for censoring more than 100% blighted shoot indicated a high general combining ability and a low specific combining ability for fire blight resistance. Genetic variance was, therefore, predominantly additive. Combining ability estimate indicated Kieffer was the superior female parent and HW 601 and Old Home were the superior male parents. If this sample of parents is representative, genetic advance for fire blight resistance should be obtained by selecting parents on the basis of phenotypic values.Key words: Pyrus, Erwinia amylovora, general combining ability, specific combining ability

scholarly journals Inheritance of resistance to cotton blue disease

2008 ◽  
Vol 43 (5) ◽  
pp. 661-665 ◽  
Author(s):  
Osmério Pupim Junior ◽  
Ivan Schuster ◽  
Ronald Barth Pinto ◽  
Ely Pires ◽  
Jean-Louis Belot ◽  
...  
Keyword(s):  
Disease Resistance ◽  
Dominant Gene ◽  
Artificial Inoculation ◽  
Inheritance Of Resistance ◽  
Greenhouse Test ◽  
Resistant Varieties ◽  
Cotton Blue ◽  
Cotton Plants ◽  
Cotton Blue Disease

The objective of this work was to determine the inheritance of cotton blue disease resistance by cotton plants. Populations derived from the CD 401 and Delta Opal resistant varieties were evaluated, through a greenhouse test with artificial inoculation by viruliferous aphids. Cotton blue disease resistance is conditioned by one dominant gene, both in CD 401 and Delta Opal varieties.

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