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There are a number of scales that can become a problem on citrus. Citricola scale, brown soft scale, black scale, and California red scale are among the most common. The scales suck sap from the tree and produce honeydew.
There are many plant viruses, and often the symptom expression of a virus is a mottled light and dark green color pattern in the leaves, especially the new growth. The leaves may be deformed and reduced in size.
The most common cause of shriveled nut meats inside a normal looking shell is inadequate or inconsistent watering. If the tree suffers even one dry period during the time when the nut meats are developing and maturing, the nut meats may shrivel. The most critical period is July through October.
This pest is very active in late summer and fall. As the worm matures, it can get up to three inches long or longer and be one-half inch in diameter. A caterpillar this size can eat its way through a lot of plant tissue in one night.
These very tiny spiders are smaller than a speck of dust when full grown. They are yellow in color and look like the top half of an exclamation point, i.e., rounded at the head, tapering to a point at the tail end.
The blister mite ( Phytotus tristriatus) is microscopic in size, and you need at least a 10 x magnification to see the mites crawling among the hairs in the blister on the undersurface of the leaves. The mites are creamy white and cigar-shaped.
By Nick Sakovich Over the past few years, Australia has been producing approximately 575,000 metric tons of total citrus per year. By far, the majority of this production is oranges, with about a 60/40 percent split between valencias and navels.
By Nick Sakovich The advent of the computer age has enabled us to accomplish many wonderful things for agriculture -- from irrigation scheduling to payroll. Even accomplishing such complicated feats as satellite metering of precise amounts of fertilizer to very small increments of land.
By Nick Sakovich New Zealand means the island of the long cloud. It is a land with ample rainfall which produces beautiful, lush plant growth and magnificent scenery. Although this past year, while we were drenching in El Nino, New Zealand was in the midst of a drought and record breaking heat.
By Nick Sakovich The Satsuma mandarin grows quite well in New Zealand. The ingredients are all there - a good export and domestic market, consumer acceptance, and low disease and pest problems, which translate into low chemical inputs.
