
Fungicide Programs
- Chlorothalonil and mancozeb protect against gummy stem blight, downy mildew, and anthracnose; chlorothalonil also protects against powdery mildew.
- The spring program is designed to manage bacterial fruit blotch, bacterial leaf spot, gummy stem blight, powdery mildew, anthracnose, and downy mildew on watermelon.
Are there pesticides in mangoes and watermelon?
The USDA Pesticide Data Program found that there are only 11 pesticide residues found on mangoes. “ Research has shown antioxidant compounds in mango fruit have been found to protect against colon, breast, leukemia and prostate cancers.” Watermelon has some of the least amount of pesticides when compared to other fruits.
What is the best fungicide for watermelon?
Fungicide Programs Chlorothalonil and mancozeb protect against gummy stem blight, downy mildew, and anthracnose; chlorothalonil also protects against powdery mildew. The spring program is designed to manage bacterial fruit blotch, bacterial leaf spot, gummy stem blight, powdery mildew, anthracnose, and downy mildew on watermelon.
What are the bugs in my watermelon?
Insect Pests of Watermelon. Spider Mites – They’re not technically bugs, but spider mites are frequent garden visitors. These almost invisible arachnids use piercing mouthparts to suck the juices right out of watermelon leaves, causing tiny yellow dots to appear all over affected leaf surfaces.
How do you know if a watermelon is pesticide free?
When buying pre-cut watermelons, look for deep color, dark seeds with flesh firmly attached to seeds, and sweet, fruity fragrance. Also, buying organic, in-season melons from your local market is the best assurance of pesticide-free fruit.
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Is watermelon high in pesticides?
Least: Watermelon Watermelon has some of the least amount of pesticides when compared to other fruits. They also contain a surprising health benefit; consuming watermelon may help relieve muscle soreness.
Are there pesticides in watermelon?
The levels of the organophosphate (OP) pesticides in the watermelon fruit ranged from 0.9 to 4,383.2 µg kg-1 whereas that of the organochlorine (OC) ranged between 0.7–34.5 µg kg-1 as well as the synthetic pyrethroids pesticides in the range of 0.1–6.4 µg kg-1.
Is watermelon part of the Dirty Dozen?
This includes avocados, sweet corn, pineapple, onions, papaya, sweet peas, asparagus, honeydew melon, kiwi, cabbage, mushrooms, cantaloupe, mangoes, watermelon, and sweet potatoes.
Does watermelon rind have pesticides?
While watermelons are considered to be among the safer fruits when eaten conventionally, the juicy flesh being protected by the thick rind, 28 pesticide residues were found by the USDA Pesticide Data Program on this beloved of fruits.
How can you tell if a watermelon has chemicals?
Watermelons do not spoil for several weeks, so there is no harm in leaving them for 2-4 days. In these 2-4 days, if you see any foam or water coming out of the surface of the watermelon, then it means that it chemically-injected.
How do you remove pesticides from watermelon?
No washing method is 100% effective for removing all pesticide residues. Scrub firm produce like melons and potatoes with a clean brush. Scrubbing firm fruits can help get more of the residues off. Rub soft produce like grapes while holding them under running water to remove residues.
What is the most heavily sprayed crop?
According to the Toxic Substances Hydrology Program of the U.S. Geological Survey, a square mile of cotton is sprayed with as much as 3988 pounds of herbicides, and 2849 pounds of insecticides, three to five times more than corn gets.
What fruit has the most pesticides?
Once again, strawberries, spinach and leafy greens (like kale and collards) are the top offenders. Nectarines, apples and grapes follow, with bell peppers, cherries, peaches, pears, celery and tomatoes stacking on.
Is it necessary to buy organic watermelon?
Thanks to watermelon's thick rind, pesticides can't get to the inner flesh [18], so it's safe to buy the non-organic versions. Watermelon is a great source of water — it's 92 percent water — but the flesh is also packed with significant levels of vitamins A, B6 and C.
How can you tell if a watermelon is chemical free?
Water Test - Cut a small slice of watermelon and place it in a pan full of water. If the water changes colour very quickly, it confirms the presence of some red colour agent in the fruit.
Are melons sprayed with pesticides?
About 50% of honeydew melons sampled had no detectable pesticide residues (6). Of those with residues, no more than four pesticides and their breakdown products were identified (6).
Is watermelon on the clean list?
The 2022 Clean 15 list now contains mango, sweet potato, and watermelon, taking the place of eggplant, broccoli, and cauliflower. Overall, nearly 70% of these fruit and veggie samples had no detectable pesticide residue after proper preparation.
How can you tell if a watermelon is chemical free?
Water Test - Cut a small slice of watermelon and place it in a pan full of water. If the water changes colour very quickly, it confirms the presence of some red colour agent in the fruit.
Is watermelon on the clean list?
The 2022 Clean 15 list now contains mango, sweet potato, and watermelon, taking the place of eggplant, broccoli, and cauliflower. Overall, nearly 70% of these fruit and veggie samples had no detectable pesticide residue after proper preparation.
What fruit has the most pesticides?
Once again, strawberries, spinach and leafy greens (like kale and collards) are the top offenders. Nectarines, apples and grapes follow, with bell peppers, cherries, peaches, pears, celery and tomatoes stacking on.
Is watermelon high risk food?
Unlike processed foods, watermelon is free of long-term health risks for most people. In fact, the low calories and high nutrient content of watermelon makes the fruit a beneficial treat for many — including those with type 2 diabetes, who need to monitor blood sugar levels.
What are the yellow spots on my lawn?
Walk fields weekly and the day before spraying. Yellow spots on leaves are symptoms of powdery mildew or downy mildew. Look for spores on the underside of leaves in the early morning. Call your local Extension office if you can’t identify the disease. Brown spots are usually gummy stem blight or anthracnose.
What is the best fungicide for downy mildew?
Anthracnose starts as dark, irregular spots with points like a star (figure 4). It also affects vines and young fruit. The best fungicides are Fli nt Extra, Cabrio, mancozeb, or chlorothalonil.
What is the most common disease in spring?
Gummy stem blight and powdery mildew are the most common diseases in spring crops. Gummy stem blight is large, round spots on the edges of leaves and dry cankers on the main stem (figure 1). The best fungicides are Miravis Prime, Switch, Inspire Super, or Luna Experience. Powdery mildew is yellow spots on the top of leaves ...
What is the best fungicide for watermelon in 2021?
Gummy stem blight and powdery mildew are the most common diseases in spring crops. Gummy stem blight is large, round spots on the edges of leaves and dry cankers on the main stem (figure 1). The best fungicides are Miravis Prime, Switch, Inspire ...
What is brown spot on vine?
Brown spots are usually gummy stem blight or anthracnose . Anthracnose also shows up as tan, narrow, sunken spots on vines.
How to get rid of fungus on watermelon?
Follow these steps to get the most out of your fungicide program. Rotate fields to crops other than cucurbits for two years in between watermelon and cantaloupe to help control gummy stem blight and anthracnose. Start spraying when vines start to run, no later than when the first (male) flowers open.
How long does Tebuconazole last on watermelon?
Tebuconazole, Inspire Super, and Luna Experience have a 7-day pre- harvest interval (PHI) on watermelon. These fungicides should not be sprayed during the harvest period (weeks 6-8 in the spray programs). When harvest begins early, skip ahead to spray number 6a or 6b listed in table 1.
What is the yellowing on watermelon leaves?
Spider Mites – They’re not technically bugs, but spider mites are frequent garden visitors. These almost invisible arachnids use piercing mouthparts to suck the juices right out of watermelon leaves, causing tiny yellow dots to appear all over affected leaf surfaces.
What are the pests that are in my garden?
If you’re leaving the hard chemicals out of the garden, you’ll have plenty of predators around to take out the stragglers. Armyworms – Armyworms spell big trouble if they’re in your garden. Unlike other caterpillars, armyworms feed as a group for most of their lives, quickly skeletonizing leaves and scarring fruits.
What do watermelon leaves look like?
Watermelon leaves will look as if something has painted white, wandering lines across their surfaces and may have white blotches to go along with these tunnels.
Can watermelon plants get bugs?
They’re easy to grow and no matter what variety you pick, you know you’re in for a real treat — that is until you find watermelon plant bugs . Unfortunately, bugs on watermelon plants aren’t an uncommon problem, but many of them are very easy to dispatch with a little dedication ...
Can bugs be on watermelon?
Unfortunately, bugs on watermelon plants aren’t an uncommon problem, but many of them are very easy to dispatch with a little dedication and know how. Read on to discover some tips and tricks to watermelon pest control.
How to tell if a vegetable is not growing?
Eggplant. One telltale sign that a fruit or vegetable wasn’t grown completely naturally is lack of flavor. While growth enhancers such as florchlorfenuron stimulate cell division to make the product grow faster, it also drains it of flavor. Florchlorfenuron isn’t the only growth hormone being used in produce.
How many pesticides are in fruit and vegetable samples?
Department of Agriculture in 2013 contained pesticide residues, with a total of 165 different pesticides on thousands of fruit and vegetable samples.
Why are watermelons bursting open?
0. Watermelons in eastern China have been bursting open, covering the fields after farmers gave them an overdose of growth chemicals during wet weather , creating what’s been called “fields of land mines.”.
Why was melon used so late in the season?
He told The Associated Press that the drug had been used too late in the season when heavy rain activity raised the risk of the fruit exploding. He also believes the variety of melon played a role. “If it had been used on very young fruit, it wouldn’t be a problem,” Wang said.
What is the cytokine in grapes?
According to the U.S. EPA, “Forchlorfenuron is a cytokin which improves fruit size, fruit set, cluster weight and cold storage in grapes in kiwifruits.”
What accelerator did farmers use to grow watermelons?
In hopes of making their watermelons bigger and more profitable, the farmers used a growth accelerator known as forchlorfenuron.
What are the growth promoting agents in produce?
Other growth promoting agents used in produce include ethylene, which may contain traces of arsenic, and calcium carbide, which is believed to cause a whole slew of health problems. To reduce your exposure to pesticides and chemicals, buy organic — especially for the foods that contain the highest levels of pesticides.
How to spot watermelons that contain such chemicals?
The most common indicator that watermelons have been “flavored” with some chemicals is their lack of flavor . They may look plump and fully ripe, but the flavor sure lacks.
What is the chemical used to kill watermelon?
The farmers spray a chemical named forchlorfenuron, a growth accelerator, on the watermelons, during overly wet weather. Forchlorfenuron is a cytokinin popular since the 1980s and promotes cell division and delays cell death. FCF acts on septins, which are essential factors in mitosis, cell division. That function results in larger and exploding ...
How to tell if a watermelon is ripe?
Rather, look for a pale yellow patch, indicating where the watermelon sat on the ground while ripening on the vine. When buying pre-cut watermelons, look for deep color, dark seeds with flesh firmly attached to seeds, and sweet, fruity fragrance.
How many calories are in a watermelon?
The watermelon contains 46 calories per cup and has no saturated fat. As the name reveals, it’s mainly composed of water (92 percent). These melons are an important source of the antioxidants beta-carotene and vitamin C.
Why does flavor come with time?
This happens due to the growth enhancers which stimulate cell division and fruits to grow faster, so the chemical drains them of flavor. If you think better, this is quite logical. Flavor indicates ripeness, which comes with time.
What is a report on farmers?
A report underscores how farmers are abusing both illegal and legal chemicals, with many farms misusing fertilizers and pesticides. This is unquestionably a consumer alert that all should be aware of. You may have observed some unusually large watermelons on the shelves lately.
What color are watermelon?
Treated watermelons are large and have a brightly colored surface, but the color of their meaty part is rather white, not red.
How many samples of corn on the cob had pesticide residues?
Less than 2% of sampled sweet corn — including corn on the cob and frozen kernels — had detectable pesticide residues ( 6, 10 ).
What fruit has no pesticide residue?
3. Pineapple. In tests of 360 pineapples, 90% had no detectable pesticide residues — due in part to their thick, inedible skin that provides a natural protective barrier ( 6, 13 ). Notably, the EWG didn’t consider contamination of the environment from pesticides used to grow this tropical fruit.
How many pesticides are in cabbage?
About 86% of cabbages sampled had no detectable pesticide residues, and only 0.3% showed more than one kind of pesticide ( 6, 16 ).
How many onions have pesticide residue?
Pesticide residues were detected on less than 10% of sampled onions, which were analyzed after the outer layers of skin were removed ( 6, 7, 8 ).
What are the clean 15?
Testing of produce sold in the US shows that the Clean Fifteen — including avocado, cabbage, onion, mango, kiwi and broccoli — often contain little or no detectable pesticide residues. Additionally, these residues are well within EPA limits.
How long do you rinse eggplant?
The eggplants were first rinsed with water for 15–20 seconds, then drained ( 6, 8, 33 ).
Why is pesticide free farming important?
This may be because pesticide-free farming encourages plants to develop their own natural defense compounds — including flavonols — against insects and other pests ( 22 ).

Scouting For Diseases
- Walk fields weekly and the day before spraying.
- Yellow spots on leaves are symptoms of powdery mildew or downy mildew. Look for spores on the underside of leaves in the early morning. Call your local Extension officeif you can’t identify the dis...
- Brown spots are usually gummy stem blight or anthracnose. Anthracnose also shows up as t…
- Walk fields weekly and the day before spraying.
- Yellow spots on leaves are symptoms of powdery mildew or downy mildew. Look for spores on the underside of leaves in the early morning. Call your local Extension officeif you can’t identify the dis...
- Brown spots are usually gummy stem blight or anthracnose. Anthracnose also shows up as tan, narrow, sunken spots on vines.
How to Get The Most Out of Spraying
- Table 1 provides details for fungicide spray programs for spring and fall crops. Follow these steps to get the most out of your fungicide program. 1. Rotate fields to crops other than cucurbits for two years in between watermelon and cantaloupe to help control gummy stem blight and anthracnose.3 2. Start spraying when vines start to run, no later than when the first (male) flowe…
Fungicide Programs
- Chlorothalonil and mancozeb protect against gummy stem blight, downy mildew, and anthracnose; chlorothalonil also protects against powdery mildew.
- The spring program is designed to manage bacterial fruit blotch, bacterial leaf spot, gummy stem blight, powdery mildew, anthracnose, and downy mildew on watermelon.
- The fall program is designed to manage gummy stem blight, downy mildew, anthracnose, an…
- Chlorothalonil and mancozeb protect against gummy stem blight, downy mildew, and anthracnose; chlorothalonil also protects against powdery mildew.
- The spring program is designed to manage bacterial fruit blotch, bacterial leaf spot, gummy stem blight, powdery mildew, anthracnose, and downy mildew on watermelon.
- The fall program is designed to manage gummy stem blight, downy mildew, anthracnose, and powdery mildew.
- Week-by-week rotation is built into the spray programs for systemic fungicides, like tebuconazole, to reduce the risk of fungicide resistance.
Important Update For 2022: Resistance to Tebuconazole
- Most (93%) samples of the gummy stem blight fungus collected in 2019 and 2021 from watermelon crops in South Carolina are moderately resistant to tebuconazole, the active ingredient in Monsoon, Folicur, and other products. Only 3% of the samples were sensitive, and 4% were highly resistant. The frequency of moderately resistant isolates on the seven farms sample…
References Cited
- Rennberger G, Gerard P, Keinath AP. Occurrence of foliar pathogens of watermelon on commercial farms in South Carolina estimated with stratified cluster sampling. Plant Disease 2018 Nov. 102(11):22...
- McGrath MT, Sexton ZF. Efficacy of fungicides for managing powdery mildew in pumpkin, 2016. Plant Disease Mangement Reports. 2017;11:V024. https://www.plantmanagementnet…
- Rennberger G, Gerard P, Keinath AP. Occurrence of foliar pathogens of watermelon on commercial farms in South Carolina estimated with stratified cluster sampling. Plant Disease 2018 Nov. 102(11):22...
- McGrath MT, Sexton ZF. Efficacy of fungicides for managing powdery mildew in pumpkin, 2016. Plant Disease Mangement Reports. 2017;11:V024. https://www.plantmanagementnetwork.org/pub/trial/pdmr/repo...
- Rennberger G, Gerard P, Keinath AP. Factors influencing the occurrence of foliar pathogens in commercial watermelon fields in South Carolina based on stratified cluster sampling. Plant Disease 2019...
- Keinath AP. Effect of protectant fungicide application schedules on gummy stem blight epide…
References Consulted
- Rennberger G, Gerard P, Keinath AP. Occurrence of foliar pathogens of watermelon on commercial farms in South Carolina estimated with stratified cluster sampling. Plant Dis. 2018. 102: 2285-2295. doi:10.1094/PDIS-03-18-0468-RE. Rennberger G, Gerard P, Keinath AP. Factors influencing the occurrence of foliar pathogens in commercial watermelon fields in South Carolin…
Additional Resources
- Keinath AP. Cucurbit downy mildew management for 2019. Land-Grant Press by Clemson Extension. 2022; LGP 1002. http://lgpress.clemson.edu/publication/cucurbit-downy-mildew-management. Keinath AP, Rennberger G. Powdery mildew on watermelon. Land-Grant Press by Clemson Extension. 2022; LGP 1019. http://lgpress.clemson.edu/publication/powdery-mildew-o…