New Braunfels Herald Zeitung (Newspaper) - July 2, 1987, New Braunfels, Texas
Page 16 Herald-Zeitung New Braunfels, Texas Thursday, July 2,1987County AgentOxygen depletion a problem in farm ponds
By BILL SCHUMANN
County Extension Agent
During the hot, dry summer, farm fish ponds often suffer from oxygen depletion, and the result is fish dieoff.
Oxygen depletion can result from a combination of factors, some of which cannot be controlled by the pond owner. One of these is tile weather. Hot, still and cloudy conditions do little to generate oxygen production in a farm pond.
In fact, this condition can cause die-offs of oxygen-producing phytoplaneton which may further increase oxygen debt. In addition, cold heavy rain can cause a pond to turn over, which further increases oxygen demand and the likelihood of a depletion.
\ pond owner can do several things to lessen the likelihood of ail oxygen depletion. One is to maintain fish populations below I,OOO pounds per surface acre. This can be a problem for pond owners managing intensively for catfish in small ponds Weed control rn the spring rather than summer will also help reduce oxygen depletion, lf weed control treatments are necessary. make spot treatments to prevent too much plant decomposition at one time.
lf oxygen depletion i.s an immediate concern, the oxygen level can be increased by pumping water from near the surace and spraying it back over the pond Another option is to back a boat and trailer into the water and use the outboard motor to circulate the water Remember, these corrective techniques are treatments and really do little to solve the real problem lf the cause of an oxygen depletion is manmade, take appropriate corrective action.
Hot, dry weather lies ahead, and oxygen depletion problems will only increase Proper management now may prevent dead fish later on.
Summer care of pecans
Pecans need special attention in the summer. That means applying zinc sprays controlling aphids and scab, pruning and irrigating.
Pecan scab will likely he a serious problem because of recent rains Fungicide sprays of Benlate. Topsin or Super Tin will prevent scab from overtaking the entire shuck Homeowners .should use Benlate
Cibolo looks at purchase of computers
By JOHN KASTNER Cor respondent
Cibolo City Council Tuesady afternoon rn a special workshop session voted to look in the possibilities of purchasing a computer accounting system after hearing some fact and figures by councilman I J Harris Harris told the council that there were some options open to the council, one being the possible purchase of a Datapomt in Megabyte accounting program.
Harris explained that one big advantage of purchasing such a system would be the location of tin* computer offices ".Sirica they'n located in Schertz, if we break down. we could be up and running in a couple ut hours ” he said Mayor Sam Bauder said the city would be considering other computer systems in the near future before a decision is made.
The system wopuld cost $5,ROO and w ould probably need not be upgraded well lino 1990, Harris said. “Or, we could spend $3,000 for a IO Megabyte system and receive additional soft ware in a piecemeal fashion,’ added
Council approved Timber Tech’s low bid for the city's new maintenance garage root which will also include either a skylight or a vent provided by die city Bauder asked the council to consider if tfie city should hire a delinquent tax attorney Council agreed it is necessary and will consider someone to work on a free plus-percentage basis.
( ouncil also approved a hike in garbage rates from the present $5.30 a month to $6 JO. One dollar will go towards the ny wfide the remainder 4 will go to Waste Management Inc. of fian Antonio, which currently holds the city's garbage collection contract.
Waste Management lias also asked the council to allow it to begin distributing 92-gallon rollaway containers throughout the city so that garbage pickup can be cut back to once weekly.
According to City Secretary Ann Smith, Waste Management has already begun weekly service to the three areas of town using the large containers, and thus far no complaints have been voiced.
Scab can develop on pecans in any part of Texas as the weather is wet and warm. Webworms are in abundance again this year and also should be controlled. Trees are weakened by the loss of leaves from this pest. This also reduces production.
Pecan growers have had to worry about sticky, sugar-covered leaves every summer due to aphid infestations. Zolone or malathion sprays can give homeowners good control of both of these problems.
Summertime drought is always a possibiity, and pecans will suffer if they do not receive at least one inch of water per week from June through September Actually, two inches is optimum.
A mature pecan tree will use more than IOO gallons of water per day If trees go more than three weeks without water, serious crop loss can occur.
Weeds and grass also use soil moisture, so keep competitive vegetation to a minimum under
pecan trees. With shallow soil and vegetation under trees, a weekly irrigation w ill be needed.
On young pecan trees, weeds slow down growth more than anything else, so use a contact herbicide such as Roundup to keep the limb spread area weed-free.
Pecan trees less than four years of age should have only one main trunk If two, three or four trunks develop. simply cut the weaker ones and leave the strongest one.
Young trees also should receive
zinc sprays every two weeks to insure maximum growth. Make your final nitrogen applicate in June, because later applications can, and probably will, result in freeze injury in December or January.
Freeze injury is showing up in parts of Texas on mature pecan trees. Sometimes it is a limb or two, but occasionally, it is the entire tree Warm winters mixed with an occasional cold spell are much more serious than a long, cold winter.
Varieites which were productive
last fall such as Wichita or Mahan have been hit the hardest. Since the pecan has a short chilling requirement of only 4CX) hours, it can have active sap as long as weather is mild.
Consequently, weak pecan trees did not go completely dormant, and when freezes do occur, freeze injury results.
Homeowners should wait until midsummer to prune out dead limbs to avoid removing limbs which may recover.
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