Foliar nutrition and wood growth in red pine: effects of darkening and defoliation on the distribution of 14C-photosynthate in young trees

1973 ◽  
Vol 51 (1) ◽  
pp. 103-108 ◽  
Author(s):  
P. V. Rangnekar ◽  
D. F. Forward
Keyword(s):  
Red Pine ◽  
Foliar Nutrition ◽  
The Third ◽  
Pine Trees ◽  
Terminal Shoot

Young red pine trees were supplied with 14CO2 through a branch in the third whorl. Darkening or removal of all other needles caused a major diversion of 14C to the expanding terminal shoot. Defoliation had a much greater effect than darkening. The diversion can be only partially explained on the basis of removal of competing sources of carbohydrate. Use as well as distribution of labeled photosynthate was affected by the treatments.

Pathogenicity of Bursaphelenchusxylophilus on three species of pine

1987 ◽  
Vol 17 (1) ◽  
pp. 51-57 ◽  
Author(s):  
P. J. Bedker ◽  
M. J. Wingfield ◽  
R. A. Blanchette
Keyword(s):  
Jack Pine ◽  
Red Pine ◽  
Pine Wood Nematode ◽  
Pine Wood ◽  
Water Extracts ◽  
Pine Trees ◽  
Branch Death

Three species of 11-year-old pine trees were inoculated with Bursaphelenchusxylophilus in the field. Four branches in single whorls on red, Scots, and jack pine trees were wounded and inoculated with 10 000 nematodes each or with water extracts from Botrytiscinerea cultures. Prior to field inoculations, the pathogenicity of the nematode isolate was confirmed on seedlings in the greenhouse. Fourteen weeks after inoculation, 27 of 80 and 13 of 52 branches were dead or dying on Scots and jack pine trees, respectively. No symptoms were observed on red pine trees inoculated with B. xylophilus or on any controls. Branch death was attributed to the formation of girdling cankers resulting from inoculation. An average of 9.14, 10.39, and 0.02 nematodes were extracted per gram of wood from branch samples collected from Scots, jack, and red pine trees at 14 weeks, respectively, and at 58 weeks an average of 13.82, 1.01, and 0.05 nematodes per gram of wood sampled were recovered. Proportions of branch samples with nematodes declined from 14 to 58 weeks after inoculation. Although limited mortality of branches occurred, the pine wood nematode was not found to cause tree death following inoculation.

A study of the olfactory responses of insect parasites to the food plant of their host

Parasitology ◽  
1938 ◽  
Vol 30 (4) ◽  
pp. 523-528 ◽  
Author(s):  
W. H. Thorpe ◽  
H. B. Caudle
Keyword(s):  
Pinus Sylvestris ◽  
Adult Life ◽  
Egg Laying ◽  
Food Plant ◽  
Next Generation ◽  
Considerable Time ◽  
Olfactory Responses ◽  
The Third ◽  
Pine Trees ◽  
Insect Parasites

1. Pimpla ruficollis is a parasite of the pine shoot moth Rhyacionia (Evetria) buoliana Schiff. (Eucosmidae) which emerges from its host a considerable time before the next generation of larvae are ready for oviposition. It seems that during this period the parasites leave the pine trees and feed on the flowers of certain Umbelliferae and probably other plants. Only after 3 or 4 weeks do they return to the pine trees where the shoots now contain larvae ready for egg laying.2. It has been shown by means of olfactometer experiments that during this first period of the adult life, the parasites are repelled by the odour of oil of Pinus sylvestris. At this time the ovaries are very small and are probably not ready for the production of eggs. After the third or fourth week of life the females become attracted by the oil of P. sylvestris and the ovaries are now relatively large.3. Since Geraniol is known to be a constituent of certain conifers, this substance was also tested. It was, however, found to be invariably repellent to the parasites.4. There is some evidence that conclusions reached as a result of experiments with P. ruficollis also apply to the ophionine ichneumonid Eulimneria rufifemur.

EFFECT OF MAGNESIUM AND POTASSIUM FERTILIZATION ON A 20-YEAR-OLD RED PINE PLANTATION

1965 ◽  
Vol 41 (3) ◽  
pp. 290-294 ◽  
Author(s):  
J. D. Gagnon
Keyword(s):  
Beneficial Effect ◽  
Pinus Resinosa ◽  
Growing Season ◽  
Red Pine ◽  
Pine Plantation ◽  
The Third ◽  
Potassium Fertilization ◽  
Current Growth

The fertilizers, Mg at a rate of 100 lbs/acre and K at 200 lbs/acre, were applied around each of 15 red pine (Pinus resinosa Ait.) to promote increased growth in a 20-year-old plantation which had failed to fulfil growth expectations. Successive measurements of diameter and height showed that the fertilizers stimulated diameter significantly after the second growing season, but height only after the third growing season. Beneficial effect of fertilizer applications on diameter and height persisted, and the differences in diameter and height between treated and untreated trees at the end of the seventh growing season was equivalent to two years' current growth.

Seasonal Growth of Dominant, Intermediate, and Suppressed Red Pine Trees

1962 ◽  
Vol 124 (2) ◽  
pp. 146-154 ◽  
Author(s):  
Theodore T. Kozlowski ◽  
Theodore A. Peterson
Keyword(s):  
Red Pine ◽  
Seasonal Growth ◽  
Pine Trees

GROWTH REGULATOR CHANGES IN RELATION TO GROWTH AND DEVELOPMENT OF PINUS RESINOSA AIT.

1966 ◽  
Vol 44 (6) ◽  
pp. 717-738 ◽  
Author(s):  
M. M. Giertych ◽  
D. F. Forward
Keyword(s):  
Red Pine ◽  
Individual Growth ◽  
Growth Promoters ◽  
Female Cone ◽  
Cone Production ◽  
Pine Seedlings ◽  
Pine Trees ◽  
Nitrate Fertilizer ◽  
Change Position ◽  
The Individual

The occurrence of growth regulators and nucleic acids in buds of red pine trees has been investigated in relation to seasonal change, position of the bud in the crown, and age of the tree. The regulators were extracted, separated by chromatography, and assayed by an Avena straight-growth test. Three growth promoters and an inhibitor were found in the buds on all occasions. All of them affected the growth of hypocotyls of red pine seedlings as well as Avena inter-nodes, and none gave an indole reaction. The regulators varied in concentration in relation to season, age, and bud position. The individual growth promoters varied independently, one of them, designated as P1, being more variable than the others. Changes in the inhibitor were frequently, but not invariably, reciprocal to those of P1. There is evidence that individual growth promoters may be concerned with separate aspects of growth. The balance between P1 and the inhibitor was related to extension growth, with the notable exception that a balance favorable to growth reappeared in September, when no growth occurs. RNA concentration declines during the summer and a deficiency of this nucleic acid could be implicated in the cessation of growth.Treatment with ammonium nitrate fertilizer caused a shift from male to female cone production and a localized increase in the number of shoots that developed in the following year. These effects were accompanied by changes in concentration of growth promoters in the buds.

Presence of the cerambycid beetles Psacothea hilaris and Monochamus alternatus affecting the life cycle strategy of Bursaphelenchus xylophilus

Nematology ◽  
2001 ◽  
Vol 3 (5) ◽  
pp. 455-461 ◽  
Author(s):  
Noritoshi Maehara ◽  
Kazuyoshi Futai
Keyword(s):  
Life History ◽  
Bursaphelenchus Xylophilus ◽  
Pinewood Nematode ◽  
Fourth Stage ◽  
Monochamus Alternatus ◽  
The Third ◽  
Life Cycle Strategy ◽  
Pine Trees ◽  
History Of ◽  
Cerambycid Beetles

AbstractAlthough fourth-stage dispersal juveniles (JIV) of Bursaphelenchus xylophilus, the pinewood nematode (PWN), developed in the presence of both Monochamus alternatus and Psacothea hilaris, the numbers and the percentage of JIV were far higher in the presence of the former than of the latter. JIV first appeared 7 days after pupation of M. alternatus and the number increased from the day of beetle eclosion to the third day thereafter, then remained stable. We conclude that the presence of specific vectors affects both the life history of the PWN and the numbers of nematodes carried by vectors emerging from killed pine trees.

Foliar nutrition and wood growth in red pine: the distribution of radiocarbon photoassimilated by individual branches of young trees

1969 ◽  
Vol 47 (11) ◽  
pp. 1701-1711 ◽  
Author(s):  
P. V. Rangnekar ◽  
D. F. Forward ◽  
N. J. Nolan
Keyword(s):  
Cell Wall ◽  
Secondary Xylem ◽  
Growth Period ◽  
Red Pine ◽  
Unit Weight ◽  
Foliar Nutrition ◽  
Cambial Growth ◽  
Carbon 14 ◽  
Insoluble Compounds ◽  
Single Branch

The distribution of photoassimilated carbon-14 in young plantation trees was studied 6 or 10 days after supplying 14CO2 for a day to a single branch in the second, third, or fourth whorl. Both apical and cambial growth occurred during the interval, and apical growth throughout the trees was measured. Elongating terminals and products of cambial growth in the fed branch were highly labeled. In all trees some 14C was exported to the adjacent side of the tree. Movement in the trunk was bidirectional, but the position of the donor branch determined the direction of major transport. Only from whorl 2 was it upward; from whorl 3 or 4 it was downward. In both directions activity decreased with distance from the base of the donor branch, and the leader did not accumulate more, per unit weight, than the intervening internodes. Some 14C entered branches arising in the path of transport.Radioactivity was concentrated only in regions of growth, whether apical or cambial. Most of the 14C was in ethanol-insoluble compounds, largely in cell wall constituents. Autoradiographs of stem sections confirmed that 14C was deposited in currently developing tracheids of secondary xylem during most of the 10-day growth period. The ratio of activity in lignin to that in cellulose was inversely related to the total 14C in the cell wall constituents.

A New Laspeyresia Species on Red Pine

1962 ◽  
Vol 94 (12) ◽  
pp. 1272-1273 ◽  
Author(s):  
T. N. Freeman
Keyword(s):  
New Species ◽  
Hind Wing ◽  
Outer Margin ◽  
Red Pine ◽  
Pine Plantations ◽  
Forest Insect ◽  
Black Line ◽  
The Third ◽  
Basal Half ◽  
Outer Half

During his study of the ecology of red pine plantations, Mr. J. L. Martin, Forest Insect Laboratory, Sault Ste. Marie, Ontario, found a species of Laspeyresia feeding as larvae under the bark of living trees. This species is described here to enable him to report on the results of his investigation.Laspeyresia resinosae, new speciesAntenna, head, thorax, and abdomen powdery-grey. Basal half of forewing grey; outer half blackish, with cupreous reflections, the tips of the scales ochreous; outer three-fifths of costa with four pairs of silvery-white geminations; the basal pair of geminations fuse into a single, angular, transverse, shiny-leaden fascia, that extends to the trailing margin just beyond the middle; a similar fascia arises from the second costal geminations, and extends only to the fold; a third leaden fascia arises from the apical geminations, extends irregularly to the tornus, and is broken into three almost equal sections; the central portions of the second and third fasciae are narrowly margined with a few black scales, representing a very poorly defined ocelloid patch; outer margin with a very distinct black line basad to the shiny leaden fringe; the black line cut by three white dashes, two opposite the breaks in the outer, transverse fascia, and the third at the tornal end of that fascia. Hind wing powdery-grey; fringe dirty-white with darker basal line. Under-surface and legs silvery-grey. Tarsi black banded. Wingspread: 9.5-10.5 mm. Moth in late June and early July.

scholarly journals Improve the Growth and Yield of Figs by Foliar Nutrition at Post-Harvest

2018 ◽  
Vol 8 (2) ◽  
pp. 41-51
Author(s):  
Khalid Jameel Shamkhi ◽  
Jawad Abed Al-Kadhim Kamal ◽  
Luma Salih Jabbar
Keyword(s):  
Leaf Area ◽  
Significant Interaction ◽  
Factorial Experiment ◽  
Ficus Carica ◽  
Growth And Yield ◽  
Foliar Nutrition ◽  
Post Harvest ◽  
The Third

A factorial experiment was carried out by spraying the fig (Ficus carica L.) trees cv. Aswad  Diyala at post-harvest in the 2014 and 2015 seasons, in one orchards of Diwaniyah city/ Iraq, with two liquid fertilizers: Azomin and Prosol at 3 levels (0, 3 and 6) g.l-1 and (0, 2 and 4) g.l-1, respectively. The results showed that third level of both fertilizers gave The widest leaf area:{(5.53, 6.42) and (5.52 , 6.38)}m2.tree-1, highest leaf content of chlorophyll{(131.63 ,132.55), (132.63 , 130.93)}mg.100g-1more N percent of leaf {(2.12 , 2.11) ,(2.31, 2.34)}%, highest carbohydrates percent of leaf {(14.65 , 15.10) , (14.83, 15.02)}%, for compounds and seasons, respectively. As for the crop that took place in the 2015 and 2016 seasons gave the highest yield{(20.50, 21.66) (20.80, 21.30)}kg.tree-1, most level of K in the fruit{(280.10, 272.70), (292.40, 288.10)}mg.100g-1 and highest content of anthocyanin{(512.10, 519.90), (482.90, 494.50)} mg.100g-1. There was a significant interaction between the experimental factors, which reached a peak in the third level, in the leaf area in the 2014 and 2015 seasons (5.85 and 6.86) m2.tree-1, and the anthocyanin in the 2015 and 2016 seasons in fruit (518.20 and 534.80) mg.100g-1, respectively. It can be concluded that the post-harvest spraying of Aswad Diyala cv., with the, Azomin and Prosol at the levels of 6 and 4g.l-1, respectively, gave the best results

scholarly journals Introduction and establishment of Microplitis croceipes a larval parasitoid of heliothis in North Island pine forests

2000 ◽  
Vol 53 ◽  
pp. 328-333 ◽  
Author(s):  
T.J.B. Herman ◽  
M.M Davidson
Keyword(s):  
Biological Control ◽  
Pinus Radiata ◽  
Pine Forests ◽  
Microplitis Croceipes ◽  
The Third ◽  
The North ◽  
Larval Parasitoid ◽  
Recent Outbreak ◽  
Pine Trees ◽  
Helicoverpa Armígera

Heliothis (Helicoverpa armigera) is a periodic pest of young pine trees (Pinus radiata) In response to a recent outbreak of this pest Microplitis croceipes a parasitoid of heliothis larvae was introduced into forests of the North Island volcanic plateau to augment biological control of heliothis A total of 13600 M croceipes pupae were released at monthly intervals over three seasons (199598) Successful overwintering of M croceipes populations confirmed establishment in the forests Mean monthly parasitism reached 107 in the third season Surveys at points radiating out from the release sites indicated that M croceipes was spreading at approximately 1 km per year

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