Egg Production of the Two-Spotted Spider Mite on Bean Plants Supplied Nutrient Solutions Containing Various Concentrations of Iron, Manganese, Zinc, and Cobalt1

1966 ◽  
Vol 59 (1) ◽  
pp. 89-93 ◽  
Author(s):  
W. N. Cannon ◽  
L. C. Terriere
Keyword(s):  
Egg Production ◽  
Spider Mite ◽  
Manganese Zinc ◽  
Bean Plants ◽  
Two Spotted Spider Mite ◽  
Iron Manganese ◽  
Nutrient Solutions

Effects of Growth Phase and Ultraviolet-B Pretreatment in Perilla Leaves on the Two-Spotted Spider Mite

2020 ◽  
Vol 49 (4) ◽  
pp. 886-894
Author(s):  
Daichi Tomimori ◽  
Munetaka Hosokawa ◽  
Shinichi Aoki ◽  
Masahiro Osakabe
Keyword(s):  
Essential Oil ◽  
Growth Phase ◽  
Egg Production ◽  
Oil Content ◽  
Spider Mite ◽  
Small Contribution ◽  
Defense System ◽  
Defense Compounds ◽  
Flowering Phase ◽  
Two Spotted Spider Mite

Abstract Perilla, Perilla frutescens (L.) Britton var. crispa (Thunb.) H. Deane, is traditionally cultivated as an edible/medicinal crop in East Asia. Its essential oil contains many bioactive compounds that are expected to have high pharmacological functionality, as well as antimicrobial and insecticidal activity. Spider mites are a major pest group for perilla cultivation. The two-spotted spider mite, Tetranychus urticae Koch, possesses divergent detoxification enzymes and has developed resistance against most acaricides. The essential oil content of perilla halves from the pre-flowering phase to the flowering phase, and ultraviolet (UV)-B radiation generally increases defense compounds. To clarify the effects of this change in essential oil content and the effects of UV-B pretreatment, we investigated the developmental success and egg production of T. urticae on leaves from the preflowering and flowering phases cultivated with and without nighttime UV-B irradiation. Both the parameters significantly increased on leaves from the flowering phase in comparison with that from the preflowering phase, suggesting that constitutively produced essential oil provided protection against mite pests in a growth phase-specific manner. The defense system also extended the developmental period of mites on red perilla leaves, but not on green perilla leaves, in preflowering phase. Although egg production was lower on red perilla leaves pretreated with UV-B, no negative effects were caused on the developmental success and duration on red and green perilla and the egg production on green perilla by UV-B pretreatment. Our findings reveal a significant impact of investment allocation of perilla plants and a small contribution of UV-B irradiation to the plant defense system.

scholarly journals Control of two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae) by predators on potted plants

1970 ◽  
Vol 27 ◽  
pp. 51-54 ◽  
Author(s):  
Mst Mursalin Parvin ◽  
Mohd Mainul Haque
Keyword(s):  
Tetranychus Urticae ◽  
Spider Mite ◽  
Phytoseiulus Persimilis ◽  
Mite Population ◽  
Potted Plants ◽  
Bean Plants ◽  
Minimum Number ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch ◽  
Stethorus Punctillum

Three predators Scolothrips sexmaculatus Pergande, Phytoseiulus persimilis Athias - Henriot and Stethorus punctillum Weise were used to control two-spotted spider mite, Tetranychus urticae Koch on potted bean plants. Mite population increased exponentially on the untreated plants, but on the predator treated plants, increase of mite population was checked and remained within minimum number. Early release of predator checked the mite population earlier and kept it lower than on late released plants. All the three predators may be used as bio-control agents against two-spotted spider mite. Key words: Control, Tetranychus urticae, Scolothrips sexmaculatus, Phytoseiulus persimilis, Stethorus punctillum and bio-control agents.   doi:10.3329/ujzru.v27i0.1954 Univ. j. zool. Rajshahi Univ. Vol. 27, 2008 pp. 51-54

scholarly journals Calcium, Magnesium and Micronutrient Uptake in Watercress (Nasturtium officinale) under Arsenic and Salinity Stress Conditions

2021 ◽  
Vol 2 (4) ◽  
pp. 251-255
Author(s):  
J Sufian ◽  
A Golchin ◽  
A Avanes
Keyword(s):  
Heavy Metals ◽  
Nutrient Solution ◽  
Nasturtium Officinale ◽  
Manganese Zinc ◽  
Randomized Design ◽  
Micronutrient Uptake ◽  
Salinity Levels ◽  
Calcium Magnesium ◽  
Iron Manganese ◽  
Nutrient Solutions

Heavy metals are elements that mainly have a 5-22 gr.cm-3 specific gravity. Some of these metals are essential micronutrients for plant growth (Such as Zinc (Zn), Copper (Cu), Manganese (Mn), Nickel (Ni) and Cobalt (Co)). Some other heavy metals, have a high toxicity properties such as Lead (Pb), Cadmium (Cd) and Mercury (Hg). In order to investigate the potential of watercress (Nasturtium officinale) in the uptake of elements from nutrient solutions with different salinities, a factorial experiment was conducted in a completely randomized design with three replications in the greenhouse. In this experiment, different levels of arsenic were zero, 5, 10, 20, 40, 40, 80 and 160 mg.L-1, which were obtained from sodium arsenate source and added to Epstein’s nutrient solution to obtain the mentioned concentrations. The salt concentration of the nutrient solution was 0, 10, 20, 40 and 80 mM which was prepared from sodium chloride source and added to Epstein solution. After making nutrient solutions with different salinity and concentrations, watercress was cultivated. The ANOVA results showed that the interaction of salinity and arsenic levels on the calcium, magnesium, iron, manganese, zinc and copper concentrations in watercress was significant at the level of one percent probability. The highest concentrations of these elements were obtained in the levels without salinity and arsenic and the lowest values were obtained in the 80 mM salinity levels and 160 mg.l-1 arsenic.

EFFECTS OF PHOSPHORUS CONCENTRATION ON Cu, Zn, Fe AND Mn UTILIZATION BY WHEAT

1974 ◽  
Vol 54 (4) ◽  
pp. 357-367 ◽  
Author(s):  
G. J. RACZ ◽  
P. W. HALUSCHAK
Keyword(s):  
Element Concentration ◽  
Iron Concentration ◽  
Calcareous Soils ◽  
Phosphorus Fertilization ◽  
Phosphorus Concentration ◽  
High Phosphorus ◽  
Manganese Zinc ◽  
Ion Antagonism ◽  
Iron Manganese ◽  
Nutrient Solutions

Greenhouse studies were conducted in which various amounts of phosphorus were added to calcareous and noncalcareous soils, and the iron, manganese, zinc and copper utilization by wheat were determined. Wheat yields were significantly increased by phosphorus fertilization; mean yields on the noncalcareous soils were greater than on the calcareous soils. Plant micro-element concentration and uptake were reduced in many instances when large amounts of phosphorus were applied. Plants grown on the calcareous and noncalcareous soils had similar concentrations of iron, manganese and copper. However, plants grown on the calcareous soils tended to contain lower amounts of zinc than plants grown on the noncalcareous soils. Concentration of micro-elements in soil-water extracts of phosphated soils, particularly for the noncalcareous soils treated with large amounts of phosphorus, tended to be greater than for nonphosphated soils. Yields were usually not affected when phosphorus at 2–100 ppm was added to nutrient solutions. Zinc and copper concentration and uptake were usually greater for plants grown in a 2-ppm phosphorus solution than for plants grown in solutions of higher concentration. In several instances, plant iron concentration and uptake were also reduced by high phosphorus concentration. Manganese uptake appeared not to be affected by phosphorus concentration. Increasing the micro-element concentration of nutrient solutions at various phosphorus concentrations did not affect yields but increased plant micro-element concentration and uptake, indicating that ion antagonism was mainly responsible for the lower utilization of microelements in high phosphorus media.

Control of two–spotted spider mite Tetranychus urticae Koch (Acari: Tetranychidae) by some selected chemicals

1970 ◽  
Vol 25 ◽  
pp. 15-18 ◽  
Author(s):  
S Hossain ◽  
MM Haque ◽  
N Nader
Keyword(s):  
Key Words ◽  
Tetranychus Urticae ◽  
Spider Mite ◽  
Mite Population ◽  
The Other ◽  
Leaf Discs ◽  
Bean Plants ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch

The experiment was conducted to study the effectiveness of four commonly used chemicals viz., deltamethrin, cypermethrin, malathion and sulphur against two-spotted spider mite (TSSM), Tetranychus urticae Koch on potted bean plants and on excised leaf discs. Mite population remained significantly lower in all treated plots except malathion treatment. The population of T. urticae differed significantly due to different chemicals and it remained lower up to 4th week on single-sprayed plants, which again increased. But in double-sprayed plants mite population was checked and remained significantly lower. The estimated LC50 values for cypermethrin, malathion, deltamethrin and sulphur were 2.9956, 15.8663, 0.5386 and 20.7045 nl.cm-2 respectively when the chemicals were sprayed before mite release. But the LC50 values for these chemicals sprayed after mite release were estimated 1.8110, 8.2746, 0.2192 and 6.8308 nl.cm-2. The use of chemicals is essential for better yield of crops. Among the four tested chemicals the pyrithroids (cypermethrin and deltamethrin) were found more effective against the TSSM than the other two. Key words: Two-spotted spider mite, Tetranychus urticae, bean, deltamethrin, cypermethrin, malathion, sulphur Univ. j. zool. Rajshahi Univ. Vol.25 2006 p.15-18

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