diff --git a/AUTHORS b/AUTHORS
index 397b896a2..fff3207a3 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -146,6 +146,7 @@ Michael Seifert
 Michal Wajszczuk
 Mihai Capotă
 Mike Lundy
+Miro Hrončok
 Nathaniel Waisbrot
 Ned Batchelder
 Neven Mundar
diff --git a/_pytest/compat.py b/_pytest/compat.py
index e5c8c3940..abad4f3c5 100644
--- a/_pytest/compat.py
+++ b/_pytest/compat.py
@@ -40,11 +40,11 @@ MODULE_NOT_FOUND_ERROR = 'ModuleNotFoundError' if PY36 else 'ImportError'
 
 if _PY3:
     from collections.abc import MutableMapping as MappingMixin  # noqa
-    from collections.abc import Sequence  # noqa
+    from collections.abc import Mapping, Sequence  # noqa
 else:
     # those raise DeprecationWarnings in Python >=3.7
     from collections import MutableMapping as MappingMixin  # noqa
-    from collections import Sequence  # noqa
+    from collections import Mapping, Sequence  # noqa
 
 
 def _format_args(func):
diff --git a/_pytest/config.py b/_pytest/config.py
index eb9c2a1f2..86632ed64 100644
--- a/_pytest/config.py
+++ b/_pytest/config.py
@@ -177,7 +177,7 @@ class PytestPluginManager(PluginManager):
     """
 
     def __init__(self):
-        super(PytestPluginManager, self).__init__("pytest", implprefix="pytest_")
+        super(PytestPluginManager, self).__init__("pytest")
         self._conftest_plugins = set()
 
         # state related to local conftest plugins
@@ -231,6 +231,11 @@ class PytestPluginManager(PluginManager):
 
         method = getattr(plugin, name)
         opts = super(PytestPluginManager, self).parse_hookimpl_opts(plugin, name)
+
+        # collect unmarked hooks as long as they have the `pytest_' prefix
+        if opts is None and name.startswith("pytest_"):
+            opts = {}
+
         if opts is not None:
             for name in ("tryfirst", "trylast", "optionalhook", "hookwrapper"):
                 opts.setdefault(name, hasattr(method, name))
diff --git a/_pytest/python_api.py b/_pytest/python_api.py
index 8e09a4a6f..838a4a50c 100644
--- a/_pytest/python_api.py
+++ b/_pytest/python_api.py
@@ -426,7 +426,7 @@ def approx(expected, rel=None, abs=None, nan_ok=False):
        __ https://docs.python.org/3/reference/datamodel.html#object.__ge__
     """
 
-    from collections import Mapping, Sequence
+    from _pytest.compat import Mapping, Sequence
     from _pytest.compat import STRING_TYPES as String
     from decimal import Decimal
 
diff --git a/changelog/3487.trivial.rst b/changelog/3487.trivial.rst
new file mode 100644
index 000000000..b6dd840f8
--- /dev/null
+++ b/changelog/3487.trivial.rst
@@ -0,0 +1,3 @@
+Detect `pytest_` prefixed hooks using the internal plugin
+manager since ``pluggy`` is deprecating the ``implprefix``
+argument to ``PluginManager``.
diff --git a/changelog/3497.trivial.rst b/changelog/3497.trivial.rst
new file mode 100644
index 000000000..c7aca0ec3
--- /dev/null
+++ b/changelog/3497.trivial.rst
@@ -0,0 +1,5 @@
+Import ``Mapping`` and ``Sequence`` from ``_pytest.compat`` instead of directly
+from ``collections`` in ``python_api.py::approx``. Add ``Mapping`` to
+``_pytest.compat``, import it from ``collections`` on python 2, but from
+``collections.abc`` on Python 3 to avoid a ``DeprecationWarning`` on
+Python 3.7 or newer.
diff --git a/doc/en/logging.rst b/doc/en/logging.rst
index 44cfaaa28..b2d98f547 100644
--- a/doc/en/logging.rst
+++ b/doc/en/logging.rst
@@ -123,7 +123,7 @@ You can call ``caplog.clear()`` to reset the captured log records in a test::
         assert ['Foo'] == [rec.message for rec in caplog.records]
 
 
-The ``caplop.records`` attribute contains records from the current stage only, so
+The ``caplog.records`` attribute contains records from the current stage only, so
 inside the ``setup`` phase it contains only setup logs, same with the ``call`` and
 ``teardown`` phases.