Flies around fruit bowl

Drosophila-wikipedia Column 8 in today’s Sydney Morning Herald stated that Sydneysiders’ kitchens have been infested by fruit flies, stating that, “They emerge from fruit and hang around all summer”. The flies referred to are not fruit flies, they are the very small vinegar or ferment flies (Drosophila). Genuine fruit flies are kept out by fly screens. Vinegar flies emerge from fruit, tomatoes, etc. as grubs (larvae) and require pupation outside the fruit in order to complete their life cycle as a fly. If these tiny pests are a persistent problem, there must be a breeding ground nearby or the kitchen needs more regular cleaning.
Vinegar flies are attracted to the smell of yeast in fermenting organic materials and drains. To eliminate the problem:

  • Do not keep fruit at room temperature in warm, humid weather
  • Cover compost and garbage containers
  • Regularly rinse out garbage containers
  • Rinse beer and wine containers before recycling
  • and treat drains with an enzyme product to break down thick scum where they can feed and reproduce.

Genuine fruit flies, the Mediterranean Fruit Fly (Ceratitis capitata) and Queensland Fruit Fly (Dacus tryoni) cause a lot of destruction in gardens. They require pupation in soil after the maggots emerge from fruit. To reduce the problem of genuine fruit flies, collect all fallen fruit, put it in a sealed black garbage bag and leave the bag in the sun for three or four days to cook the larvae (and encourage your neighbours to do the same). Never put infected fruit in the compost container.

Corn – improving pollination

All types of corn are pollinated by breezes that blow pollen from the male flowers onto the silk threads that emerge from the top of each ear of corn. This is why it is better for home gardeners to grow corn in a block rather than a long row. Each strand of silk is connected to a separate immature seed and is covered in tiny sticky hairs that collect the pollen. If some silk strands don’t receive pollen, kernels may not form along one side of a cob, or near the top of the cob. (Female part of corn plant in photo at left.)

Male flowers form at the top of the corn plant as an upright spike and lower branches that open out like umbrella spokes. Pollen forms in small yellow ovals (anthers) that release their pollen mid morning after dew has dried from the flowers (between about 9 and 11 am). The centre spike is the first part to release its pollen. Pollen release may only last from 3 to 5 days and the released pollen is only viable for up to 24 hours. (Male flower in photo at left.)
It can help when growing small quantities of sweet corn or popcorn to pollinate it by hand, to ensure that the cobs your plants produce are full of juicy kernels. In nature, silks are rarely pollinated by the same plant.

To ensure good pollination, you need a sheet of A4 paper and a clean, dry, soft paintbrush. Fold the paper in half lengthways and open it out, then fold it in half the opposite way and open it out. This helps the paper to form a shallow well. Or, you can use a small clean shallow tray – something easy to manoeuvre between the plants. Hold the paper under a male flower and gently tap the spike and lower branches of the male flower with the handle of the paint brush. When tassels are ready to be pollinated, plenty of bright yellow pollen will fall onto the paper. Collect some of the pollen on the hairs of the paintbrush and dab it onto all sides and the centre of silk strands of other corn plants. Repeat this process over several days. Once a tassel has been pollinated, the ends of the silk strands will start to turn brown. As the cobs mature, you may have to net your corn crop as birds know when corn is perfect for eating.
Corn anthers won’t release pollen when conditions are too wet or very dry, the plants will wait until conditions are favourable. In areas of Australia that experience long periods of rain, it is best to plan your corn crop to avoid the wet season.

Spring onions – saving seed

Spring onions or shallots as they are sometimes known often run to seed when weather warms in spring.
Onionseed1 Seed of green onions does not keep for long and seed collected for sowing next season will produce a vigorous crop as this seed will have come from plants that have adapted to your local soil and climate conditions. Leave several of your green onion plants to produce seed from their globular flower heads (umbrels). As seeds develop the umbrel appears like a globe of tiny greenish-white ‘buds’. As the seed matures the heads change to a pale grey and the buds begin to open and ripe, black seeds can be seen inside the buds. Not all the seeds ripen at the same time.

Onionseed2 The usual method of collecting seed from these plants is to wait until most of the seed has ripened, then cut off the seed heads into a paper bag and leave the heads until the rest of the seed ripens and drops to the bottom of the bag. After all the seeds have been collected, they can be separated from the papery debris in the bag.
However, with this method, quite often the first seeds to ripen have dropped to the ground. I prefer to take a medium sized bowl or brown paper bag with me when I go to check the vege patch and while holding the bowl under each seed head, I give the seed head a gentle shake. The collected seed is then transferred to a labelled paper bag until all the seed has been collected. I get more seed with this method and it avoids having to separate the seed from the debris.

Bees welcome

Beelvdr2 Although we do not use pesticides, in recent years we have noticed fewer bees in our garden. In response we have set up a hive under a white mulberry tree, and added a ‘bee garden’ in a corner of our vege patch. I’ve planted a short hedge of French Lavender (Lavandula dentata) that flowers from late autumn to mid spring, when few other flowers bloom. I’ve also added some Borage (Borago officinalis) as a treat for bees, and some Manuka shrubs (Leptospermum scoparium) to add its healing benefits to our honey.
The decline in bee numbers has become a global problem, with the United States losing  45 per cent of their bees and Europe has 13 million less bee colonies. It is a very serious problem because many of the foods we eat depend on bee pollination to produce crops or seed. If bee numbers continue to decline you can forget about having honey, the cost of manual pollination of crops would be exorbitant and many foods will become a luxury (See list below). Colony Collapse Disorder is the most puzzling aspect of this decline, where bees leave their hives and just disappear over winter.
In the past, CCD has been blamed on diseases, mites, poor nutrition, or Manuka Shrubpesticides, particularly the neurotoxic neonicotinoids. Last year, research at Harvard University found that long exposure to small amounts of two neonicotinoids (imidacloprid and clothianidin) are the likely cause of CCD. The European Union has already banned the use of three neonicotinoids, Unfortunately, Australia, that lags behind Europe in environmental issues, still allows the use of these pesticides.

TO ENCOURAGE BEES TO YOUR GARDEN:

Borage They need clean water, pollen and nectar. Keep a shallow container of clean water (e.g. birdbath) in your garden, and choose shrubs and annuals that flower in different months to provide a continuous supply of pollen and nectar. Both native bees and honey bees love our native shrubs. And, don’t use pesticides that harm bees. Read labels and Material Safety Data Sheets (MSDS) carefully before use. Your garden will benefit greatly from the presence of these tiny, hard-working creatures.

Common foods that need bees to produce, fruits, nuts, vegetables and seed
Apple, Apricot, Blueberry, Boysenberry, Cherry, All Citrus, Cranberry, Cucumber, Currants, Custard Apple, Elderberry, Feijoa, Gooseberry, Grapes, Guavas, Kiwifruit, Melons, Nectarine, Papaya, Passionfruit, Pawpaw, Peach, Pear, Persimmon, Plum, Pomegranate, Quince, Raspberry, Starfruit, Strawberry, Almond, Brazil, Cashew, Chestnut, Coconut, Hazelnut, Macadamia, Walnut, Marrows, Okra, Pumpkin, Squash, Zucchini.
Common foods that need bees to produce seed
Beetroot, Broad bean, Broccoli, Brussels sprouts, Buckwheat, Cabbages, Canola, Caraway, Carrot, Cauliflower, Celery, Chinese vegetables, Clover, Coriander, Cotton, Cowpea, Dill, Fennel, Linseed, Lucerne, Mustard, Nasturtium, Onions, Parsley, Parsnip, Pigeon pea, Radish, Rocket, Scarlet runner, Sesame, Silverbeet, Turnip.

http://www.businessinsider.com.au/harvard-study-links-pesticides-to-colony-collapse-disorder-2014-5
http://www.theguardian.com/environment/2014/jan/08/uk-food-security-honeybees

False spring

cloche Chilly days and nights after a brief period of perfect gardening weather occur every year in many parts of Australia. Australia is the only place where spring is said to start on the first day of September. Everywhere else, spring starts at the equinox when day and night are of equal length. This year, the spring equinox occurs on September 23rd.
Unfortunately, Australia’s deviation from world-wide practice tricks some gardeners into planting out seedlings while nights are still longer than days and soil is still too cold for root growth of warmth-loving plants. The problem can be solved by placing this simple cloche over beds that contain cold-sensitive seedlings. See: Cloche for seedlings.

Windy weather update

Transpiratiion Predictions are for more cold, windy weather on the way. Keep a close watch on your garden as wind can dry out soils faster than summer heat, resulting in cell collapse of soft tissue plants. To discover why this happens and how to protect your plants, see: Windy weather
Seedlings and many vegetable crops are vulnerable to wind damage in winter and early spring. Ripening citrus are also easily damaged by strong winds.

Snake beans

Snake bean vine Snake beans are a good value crop for the vege patch where summers are hot, and French beans may struggle or be attacked by birds. They are prolific croppers over a long period and 4 plants are probably sufficient to supply a family of 4. Ours were still cropping at the beginning of June this year. A popular ingredient in Asian dishes, they can be substituted for French beans in many recipes, and blanched, young beans can be added to salads.

Snake bean pods Snake beans can grow up to half a metre or longer but tend to become a little tough if allowed to grow to this length (i.e. the beans at the bottom of the photo). They are best eaten when 30 cm or so in length while seeds are small, and they are young and tender. Pods grow fast and should be picked every day, or every second day at least, to ensure that they are harvested at their best, and to keep the vines forming new pods.
Snake beans take up very little space in the garden as they are grown on a trellis in soil that has plenty of compost and some organic complete fertiliser added, which should keep the soil pH at an ideal level (6.5–7). In late spring, when soil temperature is at least 15 degrees Celsius, sow seeds in damp soil 1 cm deep and 30 cm apart. Water to settle soil after sowing. Do not water the soil again until seed leaves appear, then water regularly to ensure healthy growth. In tropical areas where summer rainfall is heavy, sow seeds in hills to improve drainage. Seeds germinate quickly, and vines can produce pods in 60 days in very hot weather.
Snake bean ripening Greenpatch Organic Seeds has two varieties of snake bean; one with black seeds that produces pods up to 45 cm and one with brown seeds than produces thin pods to 60 cm.
Allow a couple of pods to mature until they have yellowed and lost their ‘puffiness’ (see photo). Then continue the drying process indoors. De-pod seeds when pods are crisp.

Time to plant spring bulbs

Just a reminder that April is a good time for planting spring-flowering bulbs in most areas. Gardeners in warmer climates can put bulbs into the vegetable crisper of the fridge for a month’s chilling before planting in May.
Add plenty of compost and some complete organic complete fertiliser to the planting area. Nutrients will be absorbed by the plants during the growing season and withdrawn into the bulbs as the foliage dies back to ensure good flowering the following season, so remember not to remove foliage before it becomes brown. Bulbs are normally planted at a depth twice the width of the bulb. In warm climates, plant suitable bulbs up to twice as deep as indicated on the packet. After planting, mulch the area in early morning when the soil is cooler and keep the planted area just damp until growth appears, then water regularly. For moon planters, Full Moon phase is the best time to plant bulbs. This year (2014) the Full Moon occurs on 15th of April and May.

Garlic planting time – again

garlic1 March and April are good months for planting garlic in temperate to warmer parts of Australia. This year we are going back to growing the ‘Italian White‘ variety as our winters are becoming too mild for the hard-necked varieties. ‘Italian White‘ is a soft-necked garlic more suited to warmer areas. Cloves are slightly smaller than the purple hard-necked garlic but it has a lovely flavour and keeps longer than the hard-neck varieties.

We will sow ours in the middle of April (during Full Moon phase), after separating the knobs into individual cloves. The larger cloves from each knob will be planted, flat end down, just below the surface into soil rich in compost with a pH close to neutral. We usually plant our cloves 15 cm apart in rows 30 cm apart so that the canopy formed by the leaves helps to keep the mulched soil cooler. Garlic needs regular, deep watering (not a daily sprinkle) and hates competing with weeds. Green Harvest has a range of garlic for planting, and their garlic page will help you to decide which variety is best suited to your local climate and needs.

If you want to grow a small quantity of garlic from knobs purchased from your greengrocer, make sure it is Australian garlic. Imported garlic is treated with methyl bromide, a nasty gas that has been banned in Europe and may prevent cloves from growing.
Garlic takes 6 to 8 months to develop a bulb depending on the variety and climate.

Scallions or Spring onions

True scallions (Allium fistulosum) that originated in the Far East do not form a bulb. Also known in Australia as spring onions or green onions, these onions are a versatile herb that are used as raw or cooked vegetables In some areas they are sold as shallots, however, true shallots (Allium aggregatum) form a light brown bulb. Scallions are harvested as required as they cannot be stored for long periods. Their pencil-thick stems and hollow green leaves provide a mild flavour used raw in salads, or cooked in many Asian dishes. Chinese herbalists value them for various medicinal properties.
Scallions are easy to grow in all climate zones in Australia, and can be ready to harvest in 8 – 10 weeks. Young seedlings respond well in a compost-rich soil and an application of weak, fermented manure tea watered in several days after transplanting.
Seed of green onions does not keep for long and seed collected for sowing next season will produce a vigorous crop as this seed will have come from plants that have adapted to your local soil and climate conditions. Leave several of your green onion plants to produce seed from their globular flower heads (umbrels).
To save seeds from your spring onions, see Spring onions – saving seed