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The first issue of our new CSWCD Newsletter (name TBD) has been published!


It has articles that have been contributed by all of the CSWCD staff and is packed full of useful information for all. It includes the following articles:

Newsletter Cover

Pg       

1           New staff introductions

5           National Conservation Foundation International Competition

7           The Alliance to Advance Climate Smart Agriculture

          New Partnerships Allow Expanded Access to Stormwater Funding                                                    




Make sure to download it and join our mailing list so you never miss an issue. Just click here to sign up!


Many people fertilize their lawns in the spring. Is that a good idea? 


Generally, lawn fertilizers contain some ratio of nitrogen, phosphorus, and/or potassium. Each element promotes plant growth in its own way. Most lawn fertilizers contain a significant amount of nitrogen. Using the hypothetical example of a 50 pound bag of 29N-0P-3K blended fertilizer, the bag contains 14.5 pounds of nitrogen, 0 pounds of phosphorus, and 1.5 pounds of potassium. Nitrogen serves as the building block of plant proteins and cell development and is essential for photosynthesis. In the absence of nitrogen, or in cases where nitrogen is not available to the plant, the plant suffers. Intuitively, adding nitrogen to a lawn in the spring seems like it would be beneficial, but don’t pull out that fertilizer just yet. 


The top layer of the soil contains a combination of living and dead flora and fauna collectively known as organic matter. Organic matter plays an important role in soil water retention and nutrient cycling. By weight, organic matter is about 1%–4% nitrogen and in the stable, “organic” form, meaning organic nitrogen is not plant-available. In the spring, as the soil temperature warms, microorganisms convert the stable and unusable nitrogen into a plant-available form through a process called mineralization. The mineralized nitrogen is taken up by the plant and . . . viola! A natural spring green up has occurred. 


The natural process by which nitrogen becomes available to plants in spring can be influenced by our turf management actions. Techniques such as returning (or not removing) grass clippings provides a nutrient rich mulch that over time decomposes and increases soil organic matter. Adding other amendments including composted leaf and garden waste can raise organic matter levels, too, however there’s a fine line regarding the volume of material applied. Great care should be taken not to smother the crop you’re trying to nurture with organic matter additions. 


We’ve established that nature provides its own nitrogen to the plant community in the spring, but is it enough nitrogen? Do we need to help mother nature with supplemental nitrogen on our lawns? To answer that question, you need to consider your lawn type. Do you have warm season grasses (i.e., bermudagrass, zoysia grass, etc.) or do you have cool season grass (i.e., fescue, bluegrass, etc.)? For warm season grasses, which grow vigorously in the warm season, the first nitrogen application of the year should not be made until after the grass has broken dormancy and turned green, typically for South Eastern Virginia, that’s mid to late April. For cool season grasses, which grow vigorously in



the cool seasons (spring and fall), spring nitrogen applications, especially when over-applied, can lead to excessive growth as the hot and humid summer months approach. The stresses on the lawn caused by high rates of nitrogen in the spring can lead to many diseases including brown patch, gray leaf spot, and pythium blight. To be fair a lack of nitrogen can also lead to disease stresses in the form of dollar spot and rust. 


It is not recommended, but if you choose to apply nitrogen fertilizer to your lawn in the spring, do so sparingly. For cool season grasses, apply no more than 0.5 lbs. of water-soluble nitrogen (WIN) per 1,000 ft² of lawn area between March 15th and April 15th, then make additional nutrient applications in the fall. For warm season grasses, apply no more than 0.5 lbs. of water-soluble nitrogen (WIN) per 1,000 ft² of lawn area after April 15th, then develop and follow a fertilization program for the remainder of the growing season. 


For more detailed and site-specific information, please consider participating in the Turf Love program offered through the Colonial Soil and Water Conservation District. 


Read more articles in the Spring 2024 CSWCD Newsletter.

fertilize grass spring

This is the first article in a series I will be doing on beneficial bugs. Although there are a few well-known beneficial insects, there are so many more of which you may be unaware (and may even be trying to kill.)


First up: the green lacewings. 


Green lacewings are amazingly beneficial insects in both their larval and their adult stages, as they eat many pest insects and one individual can consume an huge number in their lifetime. There are ~85 species in the United States and more abroad.

Green Lacewing Larvae
Green Lacewing Larvae

Females lay their eggs in small groups and at the end of very long, thin stalks attached to the underside of leaves. They do this because the larvae are prone to cannibalism, but they are less likely to reach siblings when laid in the manner. 

Green lacewing eggs

Once lacewing larvae hatch they are voracious predators. They prefer soft-bodied prey like aphids, mites, thrips, mealybugs, and the eggs and larvae of other insects. Once they find their prey they will stab their hollow mouthparts (maxillae) into its body and inject a digestive secretion that rapidly dissolves the prey’s organs. Then they eat their prey by sucking their liquefied internal organs through their mouthparts like a smoothie through a straw. 

Green lacewing larvae with aphid prey
Green lacewing larvae with aphid prey

There are some larvae known as debris-carrying lacewing larvae, which attach the empty integuments (after having their organs turned into smoothies) of their prey along with random debris to their backs as a means of camouflaging themselves from predators. 


Lacewing larvae spin their cocoons for pupation and will pupate for one to three weeks on average, before emerging as adults. At the end of the summer season the last larvae will overwinter as prepupa and then proceed with pupation in the spring.


Adult lacewings are nocturnal, so they are less-commonly encountered. They are attracted to light, so you may find them outside your house if you leave lights on at night. The adults feed primarily on nectar, pollen, and honeydew but they do supplement this diet with aphids, mites, other small insects, and other arthropods. 

Green lacewing adult
Green lacewing adult

You can attract these amazing helpers to your garden by planting companion plants that provide nectar and pollen for adults. They prefer cilantro, dill, sunflowers, buckwheat, oregano, cosmos, coreopsis, asters, sweet alyssum, verbena, daisies and many more. If you have good pollinator habitat, you will be taking steps to attract green lacewings, as they like many of the same native species that we would recommend for a pollinator garden.


So, if you see these dainty green insects flying at night, crawling around on your tomatoes, or if you see a small lump of debris that appears to be crawling across a leaf all by itself, you will know what it is! 



Green Lacewing Lifecycle
Green Lacewing Life Cycle

Read more articles in the Spring 2024 CSWCD Newsletter.

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