Propagation of Areca Palms

The Areca palm can be propagated from seeds which take 2-6 months to germinate. Fresh seed should be planted in a well drained medium with the top of the seed barely visible. Cleaning the seeds is not essential if they are planted immediately. Areca palms can also be propagated by simple divisions; the offshoots cut from the base of the palm can be used to start new plants.  The Areca palm (Dypsis lutescens; often labeled as Chrysalidocarpus lutescens), also known as the butterfly palm, is found in sub-tropical and tropical climates. It is also used as a house plant, where it grows well under average home conditions, but after purchasing the plant, it must be acclimatized.  In the nursery, these palms are usually grown in full sun and need to adjust to the low light conditions found in most homes. Start by placing plants outdoors on a shady deck or beneath a tree in mild climates.  After a few weeks, move them to the brightest indoor location and then to their final place. They like medium to high lighting, usually doing well in the east, west, or south windows. Simple directions are as follows: plant in a large container and water frequently but do not allow the plant to sit in water.  Because of its dense, clustering growth habit, outdoors this palm is primarily used as a hedge to create privacy or to hide unsightly areas. Unfortunately, coqui frogs, an invasive species in Hawaii, find areca palms a good habitat and hiding place.

Planting Bulb Onions

Bulb onions are divided into groups depending on how they response to day length. There are short-day, medium-day and long-day types.  Long-day varieties do not do well in Hawai`i.  It is best to plant only short and medium-day varieties. The time of planting is also very important.  Short-day varieties should be seeded from September to March; medium-day from March to May.  Summertime planting is not a good idea.  The short-day, mild-flavored varieties include Yellow Granex, Tropic Ace, Early Texas Grano 502, Excel and Yellow Bermuda.  The pungent varieties are Awahia and Red Creole.  Medium-day varieties include Early Harvest, Amber Express, Pronto-S and San Joaquin. Onions are shallow rooted and require consistent moisture. Under watering is more harmful than over watering.  However, excess moisture can cause a soft rot to the bulb, irrigating should stop when the bulbs are large enough to pick and the top growth begins to fall over.  Outside of Hawaii, check with your local University Extension Services to find the best time to plant bulb onions in your area.

Diseases of Lettuce

Lettuce Drop There are several diseases of lettuce in which the leaves turn brown and mushy at the base. One disease is called lettuce drop, caused by the fungus Sclerotinia sclerotiorum.   It commonly occurs during cool, moist weather.  Symptoms are seen on the lower leaves as the plant approaches maturity.  The lower leaves that are in contact with the soil will wilt. Then they will develop a slimy rot, and the plant collapses.  An interesting feature is the appearance of a white, cottony fungal growth.  Tiny, hard, black ‘seeds’ called sclerotia may also be seen among the white threads. Control is difficult: 1) keep the leaves as dry as possible,  and 2) use low levels of fertilizers since succulent growth is more favorable to the disease. 3) The fungus can remain in the soil for two or three years, so crop rotation is important. Rotating with corn and onions are two options. Other crops that are affected by this fungus include beans, carrots and celery, as well as cucurbit and solanaceous crops. Bottom Rot In addition to lettuce drop, a fungal disease called bottom rot (Rhizoctonia solani) also produces symptoms of a slimy rotting of the lower leaves. Rust colored spots on the leaf petioles and midribs can also be seen. The entire plant will eventually decay and die. The disease is more severe under moist, warm weather conditions. Again, control is difficult. Keep leaves as dry as possible and fertilize sparingly. Planting on raised beds can help to keep the plants free of disease. Gray Mold Another fungal disease called gray mold (Botrytis cineria) occurs during cool, moist weather. Symptoms include a brown, slimy decay on the undersides of leaves. A fuzzy gray growth can often be seen. In general, various bacteria also infect lettuce plants. They enter the plant tissue through stomata or wounds. Cool and moist conditions favor the disease. Symptoms include brown spots, a slimy rot and wilting.  These diseases can result in the decay of the entire head.  Applications of copper based bactericides are recommended.