Summer Squash

Infobox on Summer Squash
Example of Summer Squash
Freshness facts
Optimum carrying temperature	8°C to 10°C
Highest freezing point	-0,4°C
Acceptable product temp. at loading into containers	Max. 2°C above carrying temperature
Optimum humidity	90% to 95%
Ventilation setting for containers	10 m³/hr
Storage life	1 week
Climacteric / non-climacteric	Non-climacteric
Ethylene production	Low
Ethylene sensitivity	Medium
Modified / controlled atmosphere	2% to 4% O2; 10% CO2
Potential benefits	See text
Availability
	On demand

Summer Squash

Harvesting and Handling

There are six horticultural groups of Summer squash: cocozelle, crookneck, scallop, straightneck, vegetable marrow and zucchini.

Tenderness and firmness are the major quality characteristics. The surface of Summer squash should be shiny; dullness is a sign of senescence. Fruit should be firm and free of physical injury. Dark green types should be entirely green; yellowish areas are a sign of senescence. Water loss results in a dull surface and loss of firmness.

Squash are packed in a variety of containers including bushel baskets, wire-bound wooden crates and fibreboard boxes. A plastic liner should be used in all wooden containers to prevent abrasion and retard water loss.

All types of Summer squash are extremely tender and are injured by the slightest scratch, bruise, or scuff. The yellow and scalloped squash show scuffing clearly because the ensuing darkening is obvious on a light background.

Cooling and Storage

Prompt pre-cooling after harvest reduces the rate of water loss and is essential for maximum postharvest life.

Summer squash are highly perishable and not suited for storage longer than 2 weeks. For maximum shelf-life, Summer squash should be held at 5°C to 10°C with 95% RH.

Summer squash are chilling sensitive and should not be exposed to temperatures <5°C. However, variation in chilling tolerance among Summer squash types is great. Chilled Summer squash show surface pitting and decay rapidly at non-chilling temperatures, although damage may be absent during refrigeration. Chilled fruit have increased rates of water loss upon transfer to non-chilling temperature.

Controlled atmosphere considerations

Storage in low O₂ atmospheres appears to be of little or no value for zucchini squash.

Storage disorders

Alternaria rot, Anthracnose, Bacterial rots, Black rot, Chilling injury, Cottony leak, Fusarium, Watery soft rot.