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You should prune established currant and gooseberry shrubs to encourage vigor and fruit production , improve sun penetration into the bush , and maintain good air circulation to minimize disease . These exclude voles ( “ meadow mice ” ) and rabbits , preventing them from feeding on the bark . Even marine seismic zones may be indirectly observable with the SAR technique , in the sense that geodetic observations in coastal regions experiencing seismic-cycle strain accumulation and release may help us understand subduction-zone earthquake processes . Mojave Desert that required only two satellite passes ( one before , one after ) to measure coseismic offset . If your goal is to have a supply of fruit to eat for snacks and desserts , you probably will want to choose an early variety and a later one , so that you are not overwhelmed by too many apples all at once . Cankers may appear along the stems and cause them to fall over . Because the trees are also proportionally narrower in spread , you may be able to fit two or three trees into a small space , making them a better choice for the urban landscape . An essential piece of information that still eludes us , even in thoroughly studied and instrumented areas such as southern California , pertains to the correct prediction of the locations of future earthquakes . When using the fruit for jam , you should harvest it before it is fully ripe so that natural fruit pectin levels will be higher . Space-based topographic data will enable us to acquire a basic description of features with broad spatial scales , such as entire drainage networks , that have been poorly served by the available data . At planting time you should also provide two to four inches of an organic mulch such as wood chips , pine needles , or compost . These data allow us to assess how topographic erosion control actually works . Plant young blueberry bushes in late April or early May , spacing them 3 to 4 feet apart . Although it may be difficult to make yourself remove fruit , the quality of the apples or pears you will harvest in the fall will be greatly improved by thinning . If you wish to preserve the plants ' appearance or if feeding is extensive , treatment is warranted . Although apples are fairly durable fruits , take care to avoid bruising them . However , with appropriate selection of orbital parameters , adequate distribution of ground-station facilities , and improved raw data-storage capabilities on the spacecraft , these techniques provide essentially global coverage , allowing us to sample all major exposed seis-mic zones in the world .