scholarly journals Evaluation of multi-row covers and support structure for cantaloupe and summer squash

2015 ◽  
Keyword(s):  
Support Structure ◽  
Row Covers ◽  
Summer Squash

Plastic Mulches and Row Covers on Growth and Production of Summer Squash

2008 ◽  
Vol 14 (4) ◽  
pp. 322-338 ◽  
Author(s):  
Garry G. Gordon ◽  
Wheeler G. Foshee ◽  
Stewart T. Reed ◽  
James E. Brown ◽  
Edgar Vinson ◽  
...  
Keyword(s):  
Row Covers ◽  
Summer Squash

scholarly journals Parthenocarpic Fruit Set in Summer Squash

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 883D-883
Author(s):  
Richard W. Robinson ◽  
Stephen Reiners
Keyword(s):  
New York ◽  
Fruit Set ◽  
Male Flower ◽  
Sex Expression ◽  
Gold Rush ◽  
Flower Formation ◽  
Parthenocarpic Fruit ◽  
Early Season ◽  
Row Covers ◽  
Summer Squash

Low temperatures typical of early season production promote female sex expression and reduce male flower formation in summer squash. In addition, some summer squash cultivars do not produce sufficient male flowers for good fruit set early in the season in New York. Parthenocarpic fruit set could increase early season yield as well as at times when bee activity is restricted by wet weather or by row covers. More than 30 Cucurbita pepo cultivars and breeding lines were evaluated for their ability to produce parthenocarpic fruit over the past 3 years. Pistillate flowers were closed before anthesis to prevent pollination. In 1992, 66% of all the entries set parthenocarpic fruit where as 40% displayed the same pattern in 1993 and 81% in 1994. Varieties with the best parthenocarpic fruit set included Black Beauty, Black Magic, Black Jack, and Chefini Hybrid, all zucchini types. Most yellow-fruited cultivars had poor fruit set but the precocious yellow cultivar Gold Rush had good parthenocarpic fruit set in 1992 and 1993. In 1994, floating row covers placed over the plants 1 week after planting confirmed the results of the previous two seasons. This indicates that certain varieties of summer squash consistently set parthenocarpic fruit. These varieties may be most useful for early season production or for production under plastic tunnels or row covers where pollinator activity is restricted. In addition, our results indicate that it is possible to breed parthenocarpic squash of different fruit colors and types.

Row Covers for Excluding Insect Pests from Broccoli and Summer Squash Plantings

1990 ◽  
Vol 83 (3) ◽  
pp. 948-954 ◽  
Author(s):  
R. G. Adams ◽  
R. A. Ashley ◽  
M. J. Brennan
Keyword(s):  
Insect Pests ◽  
Row Covers ◽  
Summer Squash

scholarly journals Parthenocarpy in Summer Squash

HortScience ◽  
1999 ◽  
Vol 34 (4) ◽  
pp. 715-717 ◽  
Author(s):  
R.W. Robinson ◽  
Stephen Reiners
Keyword(s):  
Disease Resistance ◽  
Cucurbita Pepo ◽  
Fruit Set ◽  
High Rate ◽  
Parthenocarpic Fruit ◽  
Row Covers ◽  
Summer Squash ◽  
Multiple Disease Resistance ◽  
Pollinating Insects ◽  
Dark Green

Summer squash (Cucurbita pepo L.) cultivars were compared for ability to set parthenocarpic fruit. Some cultivars set no parthenocarpic fruit and others varied in the amount of fruit set when not pollinated. The degree of parthenocarpy varied with season, but the relative ranking of cultivars for parthenocarpy was generally similar. Cultivars with the best parthenocarpic fruit set were of the dark green, zucchini type, but some cultivars of other fruit types also set parthenocarpic fruit. A summer squash cultivar was developed that combines a high rate of natural parthenocarpy with multiple disease resistance. Yield of summer squash plants grown under row covers that excluded pollinating insects was as much as 83% of that of insect-pollinated plants in the open.

Microscopy studies of powdery mildew on summer squash

1991 ◽  
Vol 49 ◽  
pp. 520-521
Author(s):  
John S. Gardner ◽  
W. M. Hess
Keyword(s):  
Powdery Mildew ◽  
Tip Growth ◽  
Hyphal Growth ◽  
Plant Tissues ◽  
Vegetative Hypha ◽  
Powdery Mildews ◽  
Summer Squash ◽  
Conidial Formation ◽  
Polar Tip Growth ◽  
Short Conidiophore

Powdery mildews are characterized by the appearance of spots or patches of a white to grayish, powdery, mildewy growth on plant tissues, entire leaves or other organs. Ervsiphe cichoracearum, the powdery mildew of cucurbits is among the most serious parasites, and the most common. The conidia are formed similar to the process described for Ervsiphe graminis by Cole and Samson. Theconidial chains mature basipetally from a short, conidiophore mother-cell at the base of the fertile hypha which arises holoblastically from the conidiophore. During early development it probably elongates by polar-tip growth like a vegetative hypha. A septum forms just above the conidiophore apex. Additional septa develop in acropetal succession. However, the conidia of E. cichoracearum are more doliform than condia from E. graminis. The purpose of these investigations was to use scanning electron microscopy (SEM) to demonstrate the nature of hyphal growth and conidial formation of E. cichoracearum on field-grown squash leaves.

Comments on Energy Harvesting on a 2:1 Internal Resonance Portal Frame Support Structure, Using a Nonlinear-Energy Sink as a Passive Controller

2016 ◽  
Vol 10 (3) ◽  
pp. 147 ◽  
Author(s):  
Rodrigo Tumolin Rocha ◽  
Jose Manoel Balthazar ◽  
Angelo Marcelo Tusset ◽  
Vinicius Piccirillo ◽  
Jorge Luis Palacios Felix
Keyword(s):  
Energy Harvesting ◽  
Internal Resonance ◽  
Nonlinear Energy Sink ◽  
Support Structure ◽  
Portal Frame ◽  
Energy Sink ◽  
Nonlinear Energy

Static and Dynamic Characteristic Analysis of the Tower for Vertical Axis Wind Turbine Based on Finite Element Method

2012 ◽  
Vol 229-231 ◽  
pp. 613-616
Author(s):  
Yan Jue Gong ◽  
Yuan Yuan Zhang ◽  
Fu Zhao ◽  
Hui Yu Xiang ◽  
Chun Ling Meng ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Wind Turbine ◽  
Dynamic Characteristic ◽  
Optimization Design ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Characteristic Analysis ◽  
Support Structure ◽  
Element Method

As an important part of the vertical axis wind turbine, the support structure should have high strength and stiffness. This article adopts finite element method to model a kind of tower structure of the vertical axis wind turbine and carry out static and modal analysis. The static and dynamic characteristic results of tower in this paper provide reference for optimization design the support structure of wind turbine further.

scholarly journals Optimization of support structure in multi-articulated joints of non-assembly mechanisms

Procedia CIRP ◽  
2021 ◽  
Vol 100 ◽  
pp. 726-731
Author(s):  
WK Leung ◽  
Muhammad Huzaifa Raza ◽  
Ray Y. Zhong
Keyword(s):  
Support Structure
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